Warm up a new domain or sender

Imagine a new business shows up and immediately mails ten thousand strangers. To an inbox provider, that looks exactly like a spammer. A new domain has no track record, so providers are cautious by default — and the fastest way to get filtered is to send too much, too soon. Warming up fixes this by starting small and building trust over time.

Why warming up matters

Inbox providers judge you on reputation: how many people open your email, how few mark it as spam, how steady your sending is. A new sender starts with a blank slate — not good, not bad, just unknown. Every message you send is evidence they use to decide where you belong.

• Sudden high volume from an unknown domain is one of the strongest spam signals there is.
• Early engagement — opens, clicks, replies — tells providers real people want your mail.
• Early complaints or bounces from a cold sender do outsized damage, because there's no history to offset them.

How BlueyEmail warms you up automatically

You don't have to manage this by hand. BlueyEmail supports a gradual warmup that runs over roughly 30 days, automatically increasing how much you send each day as your reputation builds. You set your campaigns as usual; the warmup paces the delivery in the background.

1. 1

   Authenticate first

   Make sure SPF, DKIM, and DMARC are verified before you start. Warming up an unauthenticated domain won't work. See Authenticate your domain.

2. 2

   Start with your most engaged contacts

   Begin with the people most likely to open and click — recent signups, loyal customers, anyone who's interacted with you lately. Their positive engagement is exactly the signal providers look for.

3. 3

   Let the daily volume ramp

   BlueyEmail increases your allowed daily send gradually across the ~30-day window. Resist the urge to override it and rush — the whole point is a smooth, believable climb.

4. 4

   Watch your engagement as you scale

   As volume grows, keep an eye on opens, bounces, and complaints. Healthy numbers mean you're ready for more; a dip is a sign to slow down.

What a healthy ramp looks like

A good warmup is boring and steady — small at first, growing a bit each day, with strong engagement throughout. You're aiming for consistency, not a dramatic spike.

• Early days: modest volume sent to your warmest, most reliable contacts.
• Middle stretch: volume climbs steadily as your reputation firms up, engagement staying strong.
• By the end (~30 days): you've reached your normal sending volume with an established, trusted reputation.
• Throughout: consistent day-to-day sending — avoid long silences followed by huge bursts, which look erratic to filters.