A sending domain is the domain your outreach emails come from. Many teams send cold email from a separate domain, such as getcompany.com or company.co, so that any damage to sender reputation from outreach does not affect the main company domain used for client and candidate email.
Cold email and lead gentopic
2 minread
3related terms
In one line
The domain your outreach comes from. Many teams send cold email from a separate domain, such as getcompany.com, to protect the main company domain's reputation.
A secondary sending domain should look clearly related to your brand, redirect to your main website and have its own mailboxes for real people. It needs full authentication: SPF, DKIM and DMARC records, plus a tracking domain if your tool uses link tracking. New domains have no reputation yet, so teams usually warm up mailboxes gradually before sending at full volume.
Mailbox providers judge reputation at the domain level as well as by mailbox and IP. Gmail counts messages from a primary domain and its subdomains together toward its bulk sender threshold, so a subdomain does not fully separate reputation. A separate registered domain offers more protection, but it must still follow the same rules on consent, opt outs and honest sender details.
Why it matters to recruiters
Agency recruiters depend on their main domain for client contracts, candidate communication and invoices. If cold outreach damages that domain's reputation, everyday email can start landing in spam. A separate sending domain limits the risk, and it lets the team scale outreach across several domains and mailboxes without putting core business email at risk.
An example from a recruiting desk
All email at one recruiting firm goes out from apexrecruiting.com. After an aggressive outreach push, client replies start landing in spam. The firm registers apexrecruitinghq.com, sets up three mailboxes with SPF, DKIM and DMARC, warms them up over several weeks and moves all cold outreach there. Main domain email recovers over the following weeks as complaints stop.
Tips that help
Pick a domain that is clearly tied to your brand and redirects to your website.
Set up SPF, DKIM and DMARC before sending a single message.
Warm up new mailboxes slowly before running full campaigns.
Keep client and candidate relationship email on your main domain.
Mistakes to avoid
Using a look alike domain that hides who you are, which breaks honest sender rules.
Sending high volume from a brand new domain on day one.
Which tools help?
A few of the deliverability tools in our directory, including our picks. Prices are the published starting price on the date we last checked.
Many teams avoid it, because cold outreach carries more risk of spam complaints and bounces. A separate sending domain protects your main domain's reputation. Small, highly personal outreach from your main domain can be fine if volumes are low and lists are clean.
Is a subdomain enough for cold email?
A subdomain helps organize sending, but mailbox providers link it to the parent domain. Gmail, for example, counts subdomain mail toward the primary domain's bulk sender volume. A separately registered domain gives more separation.
How many sending domains do I need?
It depends on volume. Many teams keep each mailbox to a modest daily volume and spread outreach across several mailboxes and a few domains. Start small, watch bounce and complaint rates and add domains only as volume grows.
