Outbound lead generation / updated 6 October 2026
Outbound lead generation: how it works, the volume it needs, and who runs it for you
Outbound lead generation means contacting buyers who have not asked to hear from you, by cold email, LinkedIn or phone, and turning their replies into booked sales meetings. Volume is the constraint: in ReplyLead's 81 campaigns with at least 500 contacted leads, the median campaign drew replies from 2.12% of contacted leads, automatic replies included, so at the median rate 1,000 contacted leads would return about 21 replies, not 21 meetings. ReplyLead runs cold email and LinkedIn for you and books qualified meetings onto your calendar, with infrastructure from $2,023 a month, plus an agreed revenue share.
What outbound lead generation is
Outbound lead generation is the seller starting the conversation. You decide which companies and which people should hear from you, contact them first, and treat a reply as the start of a sales process. Inbound is the reverse: the buyer finds you, through search, content, referrals or ads, and raises a hand.
Most B2B companies end up needing both. The difference that matters for planning is what limits each one. Inbound is limited by how many buyers are already looking for what you sell. Outbound is limited by how many of the right buyers exist, how many of them you can reach, and how much sending capacity you have to reach them without damaging it.
| Question | Outbound | Inbound |
|---|---|---|
| Who starts the conversation | You do | The buyer does |
| Typical channels | Cold email, LinkedIn, phone | Search, content, referrals, paid ads |
| What you control | Which companies and roles hear from you, and when | What you publish and where you advertise |
| What limits it | The size of your market and your sending capacity | Existing demand for what you sell |
| The first signal | A reply | A form, a demo request or a call |
Outbound is also the part you can switch on by decision. You do not have to wait for demand to arrive; you have to know who the buyer is, have a reason for them to talk to you, and have the infrastructure to reach them repeatedly.
The three outbound channels and what limits each
Cold email
Cold email reaches the most people for the least labor, and it is limited per sending mailbox. For a paid Google Workspace user account, Google documents a daily sending limit of 2,000 messages and a limit of 3,000 external recipients a day. Microsoft documents 10,000 recipients a day and 30 messages a minute for an Exchange Online mailbox, plus a separate tenant-wide external recipient limit that depends on the tenant's licences. Those are the providers' technical ceilings, not recommended cold volumes.
What ReplyLead does is a separate decision. On our current infrastructure we operate around 10 to 12 cold emails per Google Workspace mailbox per day, and around 1 to 2 per Microsoft 365 mailbox. Volume is therefore planned as a number of mailboxes and domains, each kept to a low daily figure, which is why the calculator below returns a mailbox count. The cold emails per day guide covers the reasoning and the provider sources.
LinkedIn outreach runs through a person's profile: a connection request, then messages once the request is accepted. Capacity scales with the number of profiles you run, and each profile's activity is governed by LinkedIn's own rules. It works best alongside email, because a buyer who has seen your name in one channel recognizes it in the other. See LinkedIn lead generation and cold email vs LinkedIn.
Phone
Calling is limited by people and dialing hours rather than by mailboxes. It is the channel several providers on this page lead with: memoryBlue says 85% of the meetings it books come directly from the phone, and LevelUp Leads describes its outreach as led by cold calling. For the trade-off between the two, see cold email vs cold calling.
The volume math, from ReplyLead's campaign book
Outbound planning works backwards. Start with how many replies you want a month, divide by a realistic reply rate to get the people you need to contact, multiply by the messages each person receives to get the emails, then divide the emails by what one mailbox sends to get the mailboxes.
ReplyLead's campaign book supplies the rates. Across 115 campaigns, ReplyLead recorded 429,763 emails to 242,669 contacted leads, or 1.77 messages per contacted lead. Among the 81 campaigns with at least 500 contacted leads, unique replies per contacted lead were 2.12% at the median and 2.97% at the 75th percentile. Automatic and negative replies are included, so these are reply rates, not positive-reply or meeting rates. The full definitions are in the cold email benchmarks.
- Replies wanted: 40 a month.
- People to contact: 40 / 2.12% = about 1,887 contacted leads a month.
- Emails to send: 1,887 x 1.77 = about 3,340 emails a month.
- Mailboxes: 3,340 / (10 to 12 a day x 30 days) = 10 to 12 Google Workspace mailboxes.
The step most plans skip is the next one: those 1,887 people are gone from your list once they have been contacted. If your market holds 4,000 decision-makers, that pace reaches all of them in about two months. That is what the runway calculator below measures.
Market runway calculator: how long your market lasts
Enter the size of your market and the replies you want. The calculator returns the contacts, emails and Google Workspace mailboxes that pace needs, and how many months it takes to contact every person on your list once. The example inputs are placeholders, not benchmarks; the reply rates and messages per contact are ReplyLead's measured figures.
Each month, and how long it lasts
- People to contact per month
- 1,887
- Emails to send per month
- 3,340
- Google Workspace mailboxes at 10 to 12 a day
- 10 to 12
- People in your market
- 4,000
- Months until everyone is contacted once
- 2.1 months
At the median rate, 40 replies a month means contacting about 1,887 people a month: 3,340 emails from 10 to 12 Google Workspace mailboxes. Your 4,000 contacts last 2.1 months at that pace, so you would reach every person on your list within a quarter.
Assumes a 30-day month, as in the daily volume calculator, and Google Workspace mailboxes at ReplyLead's operating figure of 10 to 12 cold emails a day. Replies include automatic and negative replies, so the calculator does not predict meetings. The calculation runs in your browser, and the numbers you type are not sent anywhere.
Who does what in an outbound program
An outbound program is a chain of jobs, and a gap anywhere in the chain stops it. The table lists the stages and who owns each when you run it yourself and when ReplyLead runs it.
| Stage | What it involves | In-house | With ReplyLead |
|---|---|---|---|
| Targeting | Choosing the companies and roles worth contacting | Your team | Agreed jointly |
| Data | Building and verifying the contact list | Your team and tools | ReplyLead |
| Sending infrastructure | Domains, mailboxes, authentication, warmup and deliverability | Your team | ReplyLead, on dedicated domains and mailboxes |
| Copy and automation | Writing, sequencing and testing the messages | Your team | ReplyLead |
| Reply handling | Triage, qualification and follow-up | Your team | ReplyLead |
| Meeting booking | Putting qualified buyers on your calendar | Your team | ReplyLead |
| Sales calls and closing | Discovery, proposals and closing | Your team | Your team |
The full sequence, step by step, is on how it works. For a comparison of hiring, buying a managed service and running software yourself, see done-for-you outbound.
What outbound lead generation costs
Outbound is priced in four main ways: a monthly retainer, a dedicated SDR billed per period, a fee per meeting, or a fixed fee plus a share of revenue. ReplyLead uses the last: infrastructure from $2,023 a month, plus an agreed revenue share.
On the pages checked 5 October 2026, OutreachBloom starts cold email at $2,400 a month and lists LinkedIn outreach at $1,000 a month. LevelUp Leads starts at $5,000, and Belkins gives an average starter price from $5,000. CIENCE publishes $7,499 for month one and $2,499 a month after, with optional SDR capacity quoted separately. SalesRoads charges $11,950 per 4 weeks for one SDR, about $12,946 a month. ProspectOut charges $100 per qualified meeting or 10% of deal value, each plus $300 a month for tools. 4 of the 13 providers publish no price on the pages checked.
The prices also cover different channels, which is why the channel matrix below matters as much as the price column. For the full list of published prices across 17 providers, see lead generation pricing; to compare outsourcing with a hire, use the SDR cost calculator.
Which channels each outbound provider names
Every provider below says it does outbound. They do not mean the same channels. The matrix marks a channel only where the provider names it as an outreach channel on its own pages.
Three groups stand out. ReplyLead, OutreachBloom, ProspectOut and Sopro name cold email and LinkedIn without phone. CIENCE, SalesHive and SalesRoads name email and phone without LinkedIn. Belkins, Callbox, Leadium, Cleverly, LevelUp Leads and memoryBlue name all three, and memoryBlue and LevelUp Leads lead with the phone.
Outbound lead generation services compared
The same 13 providers, with the channels they name and the price they publish. A dash means the channel was not named on the pages checked.
| Provider | Phone | Other channels or emphasis | Published price | ||
|---|---|---|---|---|---|
| ReplyLead Our pick | Yes | Yes | - | - | Infrastructure from $2,023 a month, plus an agreed revenue share |
| OutreachBloom | Yes | Yes | - | - | Cold email from $2,400 a month; LinkedIn outreach $1,000 a month |
| ProspectOut | Yes | Yes | - | - | $100 per qualified meeting, or 10% of deal value, each plus $300 a month for tools; managed plans $500 and $1,000 a month |
| Belkins | Yes | Yes | Yes | Voicemail, SMS and WhatsApp | Average appointment setting starter price from $5,000 |
| Callbox | Yes | Yes | Yes | Chat and events | Estimated $16,000 to $32,000 a month for one pod |
| Leadium | Yes | Yes | Yes | SMS and gifting | No price on the pages checked; contracts are month to month |
| Cleverly | Yes | Yes | Yes | - | No price on the pages checked |
| Sopro | Yes | Yes | - | Display advertising | From about GBP 3,000 a month |
| CIENCE | Yes | - | Yes | Ads and social | $7,499 in month one, then $2,499 a month; optional SDR capacity quoted separately |
| LevelUp Leads | Yes | Yes | Yes | Led by cold calling | From $5,000 |
| SalesHive | Yes | - | Yes | Offshore calling teams | Not published; one flat monthly fee, by quote |
| SalesRoads | Yes | - | Yes | - | $11,950 per 4 weeks for one SDR (about $12,946 a month) |
| memoryBlue | Yes | Yes | Yes | Phone-led | No single published rate |
Prices are in US dollars unless the provider publishes in another currency. Sopro publishes in pounds sterling, shown in pounds and not converted.
The 13 outbound lead generation services, ReplyLead first
1. ReplyLead (cold email and LinkedIn)
Builds and runs the outbound program: data, private sending infrastructure, deliverability, copy, automation and reply handling. It books qualified meetings onto your calendar, and your team runs the sales calls, discovery, proposals and closing. Your domains and mailboxes are never pooled across clients.
Published price: Infrastructure from $2,023 a month, plus an agreed revenue share.
Watch for: Its channels are cold email and LinkedIn. If you want reps on the phone, the phone-led providers below are a closer fit. In a period where nothing closes, no revenue share is owed and the infrastructure amount remains.
2. OutreachBloom (cold email and LinkedIn)
Done-for-you cold email and LinkedIn outreach, sold alongside its AI SEO and Reddit marketing services.
Published price: Cold email from $2,400 a month; LinkedIn outreach $1,000 a month.
Watch for: Priced per channel, so email plus LinkedIn means two monthly lines.
3. ProspectOut (cold email and LinkedIn)
Cold email and LinkedIn outreach with list building and appointment setting; one managed plan runs cold email and LinkedIn at the same time.
Published price: $100 per qualified meeting, or 10% of deal value, each plus $300 a month for tools; managed plans $500 and $1,000 a month.
Watch for: The per-meeting plan lists a $300 a month tools and infrastructure fee next to the $100 per meeting. Ask whether it is billed in a month with no meetings.
4. Belkins (email, LinkedIn and cold calling)
Describes itself as an outbound lead generation agency for B2B companies across 50+ industries, and builds one plan that combines email, LinkedIn and cold calling. Its service list also names voicemails and SMS / WhatsApp. The starter is described at 1,500 leads a month across 3 outreach channels.
Published price: Average appointment setting starter price from $5,000.
Watch for: Only an average starter price is published; the final number comes from a custom proposal.
5. Callbox (phone, email, LinkedIn, chat and events)
Multi-channel outreach by phone, email, LinkedIn, chat and events, combining AI-powered tools with human SDRs.
Published price: Estimated $16,000 to $32,000 a month for one pod.
Watch for: The monthly figure is an estimate for one pod; exact pricing comes after a consultation.
6. Leadium (email, phone, LinkedIn, SMS and gifting)
Appointment setting campaigns that engage buyers through email, phone, LinkedIn, SMS and gifting.
Published price: No price on the pages checked; contracts are month to month.
Watch for: No price is published. Its pricing page says every contract is month to month, so ask how much notice ends one.
7. Cleverly (LinkedIn, cold email and cold calling)
Runs B2B lead generation across LinkedIn, cold email and cold calling, with a service for each plus appointment setting and outsourced SDRs.
Published price: No price on the pages checked.
Watch for: No price on the pages checked, so it cannot be compared on cost until you have a quote.
8. Sopro (email, LinkedIn and display ads)
Calls itself a multi-channel B2B outreach service; its multi-channel page names cold email outreach, LinkedIn connections and synchronised display advertising. It says email replies, phone calls, LinkedIn messages and web chat conversations come straight to your team.
Published price: From about GBP 3,000 a month.
Watch for: Display advertising sits in the same program, so ask which channels your price includes. The pricing page states no minimum contract.
9. CIENCE (email and calling, plus ads and social)
Cold email with managed sending, verified lists and replies answered; cold calling; and an option to add calls, ads and social to email.
Published price: $7,499 in month one, then $2,499 a month; optional SDR capacity quoted separately.
Watch for: SDR capacity is optional and quoted separately, on top of the $2,499 recurring.
10. LevelUp Leads (led by cold calling)
Multi-channel outreach led by cold calling, with email and LinkedIn alongside, run by native English-speaking SDRs.
Published price: From $5,000.
Watch for: Phone leads the program. If you want email first, ask for the channel split in writing.
11. SalesHive (cold calling and email)
US-based SDRs run cold calling and email outreach end to end on its own platform. Offshore calling teams are a separate option.
Published price: Not published; one flat monthly fee, by quote.
Watch for: The quote depends on the team model (US-based or offshore SDRs), the channel mix (phone only, or phone plus email) and daily volume.
12. SalesRoads (outbound calling and email)
A sales outsourcing agency whose appointment program lists two channels: personalized email prospecting and proactive outbound calling.
Published price: $11,950 per 4 weeks for one SDR (about $12,946 a month).
Watch for: Billed per 4 weeks, so a year has 13 invoices, not 12.
13. memoryBlue (phone-led)
Says 85% of the meetings it books come directly from the phone. Its lead generation services page also lists email campaigns and LinkedIn outreach.
Published price: No single published rate.
Watch for: By its own figure most meetings come from live calls, so judge it as a calling program. The price depends on the service, the engagement structure and the scope.
How to choose an outbound lead generation service
- Which channels does the price include? OutreachBloom prices email and LinkedIn as separate monthly lines, and SalesHive quotes phone only or phone plus email. Ask for the channel split in writing.
- Whose domains and mailboxes send the email? Ask whether sending infrastructure is dedicated to you or shared with other clients. ReplyLead's is dedicated: your domains and mailboxes, never pooled across clients.
- What counts as a delivered meeting? A booked meeting, a held meeting and an accepted opportunity are different things. Agree the definition before you sign; see what an accepted sales meeting is.
- Who handles replies, and how fast? A reply that waits a day is worth less than one answered within the hour. Ask who reads replies and what they do with each type.
- What is the term, and what ends it? ReplyLead sets the revenue-share percentage, attribution window and other terms in the proposal. Leadium says all its contracts are month to month; SalesHive sells month to month or annual plans at a lower monthly rate, and cancels on written notice; SalesRoads bills per 4 weeks. Ask how much notice ends the contract.
- What do you pay in a month with no meetings? At ReplyLead, the infrastructure amount remains and no revenue share is owed. ProspectOut lists a $300 monthly tools fee next to its $100 per meeting; ask whether it is billed in a month with no meetings.
If you want those answers for ReplyLead, they are on the pricing page and how it works, or you can apply for a campaign review.
How this page was built
We did not buy or test these services. Every provider fact comes from that provider's own published pages, read on 5 October 2026, and each quoted channel and price was matched against the text of those pages on that date. A channel is marked only where the provider names it as an outreach channel; a dash or an empty ring means it was not named on the pages checked, not that the provider cannot run it. Prices are as published, in the currency shown. ReplyLead's reply rates and messages per contacted lead come from its own campaign book, a snapshot of 115 campaigns extracted on 12 August 2026; they describe past replies, not a forecast. Google's and Microsoft's sending limits come from their own documentation. ReplyLead publishes this comparison and lists itself first.
Outbound lead generation questions
What is outbound lead generation?
Outbound lead generation is contacting potential buyers who have not asked to hear from you, by cold email, LinkedIn or phone, and turning their replies into sales meetings. The seller chooses the companies and the people first. ReplyLead runs the cold email and LinkedIn version for B2B companies and books qualified meetings onto your calendar.
What is the difference between inbound and outbound lead generation?
Who starts the conversation. In outbound, you choose the buyer and reach out first. In inbound, the buyer finds you through search, content, referrals or ads and raises a hand. Outbound is limited by the size of your market and your sending capacity; inbound is limited by existing demand for what you sell.
What are the main outbound lead generation channels?
Cold email, LinkedIn and the phone. Of the 13 providers compared on this page, all 13 name email, 10 name LinkedIn and 9 name phone outreach on their own pages, and 6 name all three.
How many emails does outbound lead generation need?
Work back from replies. In ReplyLead's 81 campaigns with at least 500 contacted leads, the median campaign drew replies from 2.12% of contacted leads, and across 115 campaigns each contacted lead received 1.77 messages on average. At those rates, 40 replies a month takes about 1,887 contacted leads and 3,340 emails. Replies include automatic and negative ones, so they are not meetings.
How many cold emails can one mailbox send per day?
Google documents a daily sending limit of 2,000 messages and 3,000 external recipients for a paid Google Workspace user account, and Microsoft documents 10,000 recipients a day for an Exchange Online mailbox, plus a tenant-wide external recipient limit. Those are technical ceilings, not cold email volumes. ReplyLead operates around 10 to 12 cold emails per Google Workspace mailbox per day and around 1 to 2 per Microsoft 365 mailbox.
How much do outbound lead generation services cost?
ReplyLead charges infrastructure from $2,023 a month, plus an agreed revenue share. Among the other providers checked 5 October 2026, OutreachBloom starts cold email at $2,400 a month, LevelUp Leads starts at $5,000, Belkins gives an average starter price from $5,000, SalesRoads charges $11,950 per 4 weeks for one SDR, and ProspectOut charges $100 per qualified meeting plus $300 a month for tools. 4 of the 13 publish no price on the pages checked.
Which outbound lead generation companies use cold calling?
ReplyLead's channels are cold email and LinkedIn. Among the providers checked, memoryBlue says 85% of the meetings it books come directly from the phone, LevelUp Leads leads with cold calling, and SalesHive and SalesRoads pair outbound calling with email. Belkins, Callbox, Leadium, Cleverly and CIENCE name calling alongside other channels.
Should I build outbound in-house or outsource it?
Compare the full cost and the jobs involved. An in-house program needs someone to own targeting, data, sending infrastructure, copy, reply handling and meeting booking, on top of the SDR's salary and tools. An outsourced program moves those jobs to a provider. Either way, write down who owns each stage before you start.
How big does my market need to be for outbound?
Big enough to last at your pace. Divide the people you can reach by the contacted leads you need each month. At the median 2.12% reply rate, 40 replies a month uses about 1,887 contacts a month, so a list of 4,000 people lasts about two months. The market runway calculator on this page does the arithmetic with your numbers.
Is outbound lead generation legal?
The rules differ by country. In the United States, CAN-SPAM applies; in the UK, PECR and the UK GDPR; in the EU, the GDPR and national e-privacy rules; in Canada, CASL. ReplyLead's guide to cold email law quotes each regulator's own wording. This page is not legal advice.
When this page does not apply
It does not apply to consumer (B2C) selling, where the rules and the channels differ. It does not forecast meetings, close rates or revenue: the reply rates are ReplyLead's past campaign results across its own programs, not an industry norm, and the calculator only does arithmetic on the inputs you enter. Provider channels and prices are as published on 5 October 2026 and can change after that date. If your market holds only a few hundred reachable companies, plan named-account outreach rather than volume. If you need a team to run the sales calls and close, note that ReplyLead books meetings and your team runs the sales process.
Sources
- ReplyLead, cold email benchmarks 2026 - 429,763 emails to 242,669 contacted leads across 115 campaigns; 1.77 messages per contacted lead; percentiles across the 81 campaigns with at least 500 contacted leads. Snapshot 12 August 2026; checked 5 October 2026.
- ReplyLead, cold emails per day - around 10 to 12 cold emails per Google Workspace mailbox per day and 1 to 2 per Microsoft 365 mailbox; a 30-day month in the volume calculator. Checked 5 October 2026.
- ReplyLead pricing - infrastructure from $2,023 a month, plus an agreed revenue share. Checked 5 October 2026.
- ReplyLead, how it works - the stages ReplyLead runs and the sales calls your team runs. Checked 5 October 2026.
- Google Workspace Admin Help, Gmail sending limits in Google Workspace - a daily sending limit of 2,000 messages and 3,000 external recipients per day for a paid user. Checked 5 October 2026.
- Microsoft Learn, Exchange Online limits - 10,000 recipients per day and 30 messages per minute per mailbox; the Tenant External Recipient Rate Limit. Checked 5 October 2026.
- OutreachBloom: outreachbloom.com - channels and pricing as named by OutreachBloom. Checked 5 October 2026.
- OutreachBloom: outreachbloom.com/pricing - channels and pricing as named by OutreachBloom. Checked 5 October 2026.
- ProspectOut: prospectout.com - channels and pricing as named by ProspectOut. Checked 5 October 2026.
- ProspectOut: prospectout.com/pricing - channels and pricing as named by ProspectOut. Checked 5 October 2026.
- Belkins: belkins.io - channels and pricing as named by Belkins. Checked 5 October 2026.
- Belkins: belkins.io/appointment-setting - channels and pricing as named by Belkins. Checked 5 October 2026.
- Callbox: callboxinc.com - channels and pricing as named by Callbox. Checked 5 October 2026.
- Callbox: callboxinc.com/lead-generation-pricing - channels and pricing as named by Callbox. Checked 5 October 2026.
- Leadium: leadium.com - channels and pricing as named by Leadium. Checked 5 October 2026.
- Leadium: leadium.com/pricing - channels and pricing as named by Leadium. Checked 5 October 2026.
- Cleverly: cleverly.co - channels and pricing as named by Cleverly. Checked 5 October 2026.
- Sopro: sopro.io - channels and pricing as named by Sopro. Checked 5 October 2026.
- Sopro: sopro.io/solutions/multi-channel-marketing-agency - channels and pricing as named by Sopro. Checked 5 October 2026.
- Sopro: sopro.io/pricing - channels and pricing as named by Sopro. Checked 5 October 2026.
- CIENCE: cience.com - channels and pricing as named by CIENCE. Checked 5 October 2026.
- CIENCE: cience.com/pricing - channels and pricing as named by CIENCE. Checked 5 October 2026.
- LevelUp Leads: levelupleads.io - channels and pricing as named by LevelUp Leads. Checked 5 October 2026.
- LevelUp Leads: levelupleads.io/packages - channels and pricing as named by LevelUp Leads. Checked 5 October 2026.
- SalesHive: saleshive.com - channels and pricing as named by SalesHive. Checked 5 October 2026.
- SalesHive: saleshive.com/pricing - channels and pricing as named by SalesHive. Checked 5 October 2026.
- SalesRoads: salesroads.com - channels and pricing as named by SalesRoads. Checked 5 October 2026.
- SalesRoads: salesroads.com/pricing - channels and pricing as named by SalesRoads. Checked 5 October 2026.
- memoryBlue: memoryblue.com - channels and pricing as named by memoryBlue. Checked 5 October 2026.
- memoryBlue: memoryblue.com/lead-generation-services - channels and pricing as named by memoryBlue. Checked 5 October 2026.