Warm up your domain,
land in the inbox
A new sending domain has no reputation. Send too much too fast and mailbox providers route you to spam — or your account gets throttled. Warming up means ramping volume gradually so providers learn to trust you. Here’s how to do it right.
Two metrics keep you
in the inbox
Every mailbox provider grades senders on these two — and so does the sending infrastructure behind Posthawk. Stay under them and you keep landing in the inbox. Cross them and sending gets throttled or paused.
Start small, double
while it stays clean
Send to your most engaged contacts first, and roughly double each day as long as bounces stay under 5% and complaints under 0.1%. If rates climb, hold or pull back a step before continuing.
Most engaged recipients only
Recent openers and active users
Watch bounce + complaint rates
Hold here if rates climb
Roughly double daily if clean
Ramp to your target steadily
These are guidelines, not hard rules — your right pace depends on list quality and engagement. The principle is constant: gradual, engaged-first, and watch your metrics.
Do
- Only send to people who explicitly opted in
- Send your most engaged contacts first — opens build reputation
- Authenticate with SPF, DKIM, and DMARC (Posthawk sets DKIM + SPF for you)
- Include one-click unsubscribe (Posthawk adds List-Unsubscribe automatically)
- Clean your list — remove role addresses, typos, and stale contacts
- Increase volume gradually and watch your bounce + complaint rates
Don’t
- Buy or scrape email lists — the fastest way to get blocked
- Blast a large cold list on day one from a brand-new domain
- Ignore bounces — repeated hard bounces tank your reputation
- Send to addresses that have hard-bounced or complained before
- Use misleading subject lines or hide the unsubscribe link
- Suddenly 10× your volume — mailbox providers throttle spikes
The hard parts,
handled for you
No IP warm-up needed
You send on pre-warmed, professionally-managed shared infrastructure — so there are no IPs for you to warm up. You only ramp your volume and list as below.
Automatic list protection
Hard bounces and complaints are suppressed automatically, and addresses that soft-bounce repeatedly are removed — so a few bad addresses can’t wreck your reputation.
Reputation in plain sight
Live bounce, complaint, and delivery rates in your dashboard, with a heads-up before you approach the limits that get senders throttled.
Dedicated IPs when you scale
High-volume senders can add managed dedicated IPs — automatically warmed and scaled per mailbox provider, with no manual ramp to run yourself.
Start with a warm sender
Posthawk handles the infrastructure, authentication, and list hygiene — you focus on sending email people actually want.