Recruitment firms running cold email need domain architecture that most generic cold email guides don't address: two separate outreach programs (candidate outreach and business development) that must be isolated from each other and from the agency's primary client-communication domain. A complaint spike from a motivated candidate batch should never reach the business development sending domain — and neither should reach the primary agency domain that handles placement agreements, client invoices, and candidate job offer correspondence.
The Three-Domain Structure for Recruitment Cold Email
💡 TL;DR
Recruitment firms need three separate domain tracks: the primary agency domain (never used for cold email), a candidate outreach sending domain (for passive candidate searches and talent outreach), and a business development sending domain (for reaching HR directors, talent acquisition leaders, and hiring managers to win new mandates). Pre-warmed GWS inboxes from Litemail ($4.99/inbox) for candidate outreach, MS365 for business development — both at 25–30 emails per inbox per day due to the higher complaint sensitivity of recruitment outreach. Each program fails independently without contaminating the others.
Here's the complete domain architecture and the reasoning behind each structural decision.
Domain Track 1: Candidate Outreach
Candidate outreach sending domains should be named to reflect the talent/careers context — not generic agency branding. Something like yourfirmtalent.com, yourfirmcareers.com, or candidatesource-yourfirm.com. The name should read as relevant to a candidate receiving an email at this domain — it signals what kind of outreach this is.
Inbox Type for Candidate Outreach
Candidates use Gmail as personal email far more than any other provider. GWS inboxes achieve better placement for Gmail-hosted recipients. For most recruitment candidate outreach lists, GWS should be the primary inbox type — 70% GWS / 30% MS365 handles the mix of personal Gmail and corporate Outlook addresses that appear in typical passive candidate lists.
Volume Settings for Candidate Outreach
25–30 emails per inbox per day — more conservative than standard B2B outbound. Candidates receiving unexpected recruitment emails have a higher propensity to mark as spam than business professionals receiving B2B commercial email. The complaint rate risk from candidate outreach is the primary reason to keep per-inbox volume conservative. Conservative volume protects the candidate sending domain reputation while keeping effective outreach volumes manageable.
Inbox Count for Candidate Outreach
At 25–30 emails/inbox/day: 3 inboxes reaches 75–90 candidates per day, 5 inboxes reaches 125–150 per day. For firms prospecting 300–500 passive candidates per week: 5–6 pre-warmed GWS inboxes on the candidate domain is the correct pool size.
Domain Track 2: Business Development Outreach
Business development sending domains for recruiters should read as a professional B2B sub-brand. HR directors and talent acquisition leaders receiving outreach at yourfirmpartners.com or getyourfirm.com see a legitimate-looking business domain. Avoid names that explicitly signal recruitment in the business development domain — these contacts are evaluating your firm as a potential vendor, not a candidate source.
Inbox Type for Business Development
HR directors, talent acquisition leaders, and hiring managers at mid-to-large companies predominantly use Exchange or Outlook for corporate email. MS365 inboxes achieve 6–9 percentage points higher primary inbox placement for Exchange recipients versus GWS inboxes. MS365 is the correct primary choice for recruitment business development outreach to corporate HR targets.
Volume Settings for Business Development
35–45 emails per inbox per day — slightly more conservative than standard B2B outbound but less conservative than candidate outreach. HR contacts are business email users with lower spam complaint rates than personal email recipients. The 35–45 range keeps inbox reputation healthy while reaching meaningful outreach volume.
Inbox Count for Business Development
Most recruitment firms target 50–150 new business development prospects per week. 2–3 MS365 inboxes at 35–45 emails/day covers this volume. At $4.99/inbox from Litemail, 3 MS365 inboxes costs $14.97/month for the business development sending infrastructure.
Domain Track 3: Primary Agency Domain — Never Used for Cold Email
The primary agency domain — yourfirm.com — handles the most business-critical email: placement agreements, client invoices, candidate offer letters, reference check correspondence, and ongoing client relationship management. Any reputation damage to this domain from cold outreach volume or complaint events would affect all of this business-critical email.
Never use the primary domain for cold outreach, even for a single test. The domains are registered, the infrastructure is separate, and the cost to maintain separation ($4.99/inbox from Litemail, $9/year per sending domain from Cloudflare) is negligible relative to the risk of damaging your primary domain's reputation.
DNS Setup for Recruitment Sending Domains
Both sending domain tracks need SPF, DKIM, and DMARC configured before any send. For candidate outreach domains using GWS inboxes from Litemail: SPF, DKIM (2048-bit), and DMARC are configured automatically on inbox delivery. No manual DNS setup required. For business development domains using MS365 inboxes from Litemail: the same — automated configuration including MS365's CNAME-based DKIM records.
After delivery, verify DNS using the standard MXToolbox check on each sending domain, then send a test email from one inbox to Gmail and confirm spf=pass dkim=pass dmarc=pass in the headers. Both sending domains should show Good or High in Google Postmaster Tools within 48 hours of receiving Litemail pre-warmed inboxes.
Pre-Warmed Inboxes for Both Recruitment Sending Programs
Litemail pre-warmed GWS and MS365 inboxes — $4.99/inbox, automated DNS for both domain tracks, delivered in 24 hours. Under $40/month for the complete two-program recruitment domain infrastructure.
Get Pre-Warmed Inboxes from $4.99 →
GWS and MS365 available · No minimum order · Automated DNS · Delivered in 24 hours
About Litemail — Litemail provides pre-warmed Google Workspace and Microsoft 365 inboxes for cold email outreach. From $4.99/inbox with automated DNS, dedicated US and EU IPs, and full admin access. View pre-warmed inbox plans →
Related reading:
Cold Email Recruitment Agency Setup Guide 2026 · Cold Email Domain Setup Guide 2026 · Buy Pre-Warmed Domains — Setup Guide 2026 · SPF/DKIM/DMARC Auto-Setup 2026 · Best Pre-Warmed Inbox Providers 2026 (Ranked)
Key Takeaways
Recruitment firms need three domain tracks: primary agency domain (no cold email), candidate outreach sending domain, and business development sending domain. Isolation between tracks ensures one program's complaint or bounce spike never contaminates another program's domain reputation.
Candidate outreach: GWS primary (70%) / MS365 supplementary (30%), 25–30 emails per inbox per day, domain named to reflect talent/careers context. Personal email recipients have higher complaint rates than corporate email — conservative volume is essential.
Business development: MS365 primary, 35–45 emails per inbox per day, domain named as professional B2B sub-brand. HR contacts use Exchange predominantly — MS365 delivers 6–9 points higher placement for this recipient segment.
Never use the primary agency domain for any cold outreach. The primary domain handles placement agreements, invoices, and offer letters — any reputation damage affects business-critical email.
Litemail provides both GWS and MS365 pre-warmed inboxes at $4.99/inbox with automated SPF/DKIM/DMARC. The complete two-program infrastructure costs under $40/month for most recruitment firm outreach volumes.
Frequently Asked Questions
What domain should recruiters use for cold email candidate outreach?
A dedicated sending domain that reads as relevant to candidates — something like yourfirmtalent.com, yourfirmcareers.com, or candidatesourceyourfirm.com. Never the primary agency domain. The candidate sending domain should be clearly separate from both the primary agency domain and the business development sending domain — isolated so complaint or bounce events from candidate outreach stay contained to this domain only.
Should recruiters use GWS or MS365 for candidate outreach?
GWS primary (70%) for candidate outreach — passive candidates predominantly use Gmail as personal email, and GWS-to-Gmail placement is higher than MS365-to-Gmail. Add 30% MS365 inboxes to handle candidates who receive email at corporate Outlook or Exchange addresses. For business development outreach to HR and hiring managers, flip to MS365 primary — corporate HR predominantly uses Exchange.
How many inboxes does a recruitment firm need for cold email?
For 300–500 candidate contacts per week: 5–6 pre-warmed GWS inboxes at 25–30 emails/day on the candidate sending domain. For 100–200 business development prospects per week: 2–3 pre-warmed MS365 inboxes at 35–45 emails/day on the BD sending domain. Total: 7–9 inboxes at $34.93–$44.91/month from Litemail.
Recruitment Firm Cold Email Infrastructure — Two Programs, Isolated, Under $45/Month
Litemail pre-warmed inboxes — $4.99/inbox, GWS for candidate outreach and MS365 for business development, automated DNS for both domain tracks, dedicated US and EU IPs. Complete two-program recruitment infrastructure for under $45/month total. No minimum order. Delivered in 24 hours.
Get Pre-Warmed Inboxes from $4.99 →
GWS and MS365 available · No minimum order · Automated DNS · US and EU IPs included
About Litemail — Litemail provides pre-warmed Google Workspace and Microsoft 365 inboxes for cold email outreach. From $4.99/inbox with automated DNS setup, dedicated US and EU IPs, 4 to 12 weeks of genuine warm-up history, and full admin access. View pre-warmed inbox plans →
Related reading: Cold Email Recruitment Agency Setup Guide 2026 · Cold Email Domain Setup Guide · Best Pre-Warmed Inbox Providers 2026 (Ranked)
