Agencies send on behalf of many client domains and must isolate reputation per client.
What email warm-up is#
Warm-up is the practice of gradually increasing sending volume from a new domain or IP so mailbox providers can build a positive reputation profile before you reach full volume.
Why it matters#
Providers throttle or reject sudden volume from unknown senders. Skipping warm-up is the most common way new domains end up in spam permanently.
Implementation plan for marketing agencies#
- Start with 20 to 50 messages per day per mailbox to your most engaged, opt-in contacts.
- Double volume every 2 to 3 days while complaint and bounce rates stay clean.
- Prioritize recipients likely to reply or click; positive engagement accelerates trust.
- Monitor Postmaster Tools daily and pause the ramp if reputation drops.
- Reach target volume over 4 to 6 weeks for a cold domain; faster if you have an established parent domain.
Priorities specific to marketing agencies#
Agencies send on behalf of many client domains and must isolate reputation per client. Weight your effort toward the steps above that address this constraint first, and measure with metrics that match how marketing agencies generate value from email.
Common mistakes#
- Warming with fake engagement networks that providers now detect and penalize.
- Warming the IP but sending from an unauthenticated subdomain.
- Treating warm-up as one-time; reputation decays after inactivity.
Frequently asked questions#
How long does email warm-up take?
Two to six weeks depending on target volume and whether the domain is brand new.
Do I need to warm up a shared IP?
The IP is already warm, but your domain is not. Domain warm-up still applies.