Cold Email Infrastructure for Recruiting and Staffing Agencies

Agencies email two very different audiences. Clients (hiring managers, HR and talent leaders) get business development emails offering your services. Candidates get messages about specific roles. The audiences, volumes and risks differ, so the infrastructure should be separate too.

Client outreach vs. candidate outreach

How many mailboxes and domains?

A cautious rule is about 30 emails per warmed mailbox per day, including follow-ups, with 2–3 mailboxes per domain. Scale by adding mailboxes rather than pushing each one harder; see cold email sending limits.

Add domain costs ($13 / ₹1,099 per year each) and your sequencer or ATS email tool. Model your exact numbers in the cost calculator.

Setting up outbound for an agency

1. 1

   Split client and candidate streams

   Register separate lookalike domains for business development and for candidate outreach, and forward all of them to your main agency site so recipients can check who you are. How to buy domains for cold email.

2. 2

   Authenticate and warm every mailbox

   Each sending domain needs SPF, DKIM and DMARC, and each mailbox needs about three weeks of warmup before cold sends. Keep a few warmed spare mailboxes for when a big role opens and volume spikes. Warmup guide.

3. 3

   Give each recruiter their own mailboxes

   Recruiting is personal; candidates reply to people. Name mailboxes after the recruiter (e.g. priya@acmetalentjobs.com) with a real signature, role and agency website. It also keeps per-recruiter reporting clean.

4. 4

   Verify sourced contact data

   Candidate emails found through sourcing tools go stale quickly as people change jobs. Verify every list before sending and suppress anyone who bounced, opted out or asked not to be contacted, across all recruiters.

5. 5

   Write role-specific, short messages

   For candidates: the role, location or remote, why their background fits, and a simple question. For clients: a specific reason you are writing (a role they posted, a team they are growing) and one ask. Plain text, no attachments in the first email, one link at most.

6. 6

   Connect mailboxes to your sequencer

   Import the mailboxes into Instantly, Smartlead or your recruiting outreach tool, set daily caps and sending windows in the recipient's time zone. How to connect mailboxes.

7. 7

   Track replies, not opens

   Measure positive replies, candidate submittals and client meetings per 100 contacts. Pause any mailbox whose bounces or complaints rise.

Compliance basics for recruiters

This is general guidance, not legal advice. Rules depend on where the recipient is, whether they are a business or an individual, and how you obtained their data. Check local law, and ask a qualified adviser if you email at scale across several countries.

• United States (CAN-SPAM): commercial emails need accurate sender information, an honest subject line, a valid physical postal address, and a working opt-out honoured within 10 business days. Client business development emails are typically commercial; whether a candidate message counts depends on its primary purpose, so following the same basics for both is the safer habit.
• EU and UK (GDPR, and PECR in the UK): candidate and contact details are personal data. You need a lawful basis (often legitimate interests for relevant B2B and recruitment contact), should tell people where you got their data and how to object, and must stop on request. The UK and some EU countries have extra rules for emailing individuals and sole traders.
• Canada (CASL): generally stricter and consent-based, with limited exceptions. Check before emailing Canadian contacts.
• Everywhere: keep one shared suppression list for the whole agency, delete data you no longer need, and never buy lists of personal email addresses.

Where ReplyDak fits

ReplyDak builds the sending side: it buys lookalike domains (or uses yours), sets up MX, SPF, DKIM, DMARC and verification records on Cloudflare automatically, forwards every domain to your agency website, creates Google Workspace mailboxes for each recruiter, and warms them up (about 2 to 30 emails a day over roughly 21 days, slowing down or pausing automatically if bounces, spam placement or complaints rise). Export mailboxes as CSV for Instantly, Smartlead and other sequencers. Billing is monthly, in USD, EUR or INR with a GST invoice. ReplyDak does not guarantee inbox placement, and compliance with recruiting and privacy law stays with your agency.