Glossary
What is cold-email warm-up?
Cold-email warm-up means starting a new mailbox or domain on a small number of emails a day and raising it slowly, so mail providers learn to trust it. A new address that suddenly sends hundreds of emails looks like spam, and its mail starts landing in junk folders.
Why does it matter?
Gmail, Outlook and others judge each sender by its history: how much it sends, how many messages bounce, and how many people mark them as spam. A sender with no history has no trust yet. Sending a little, to real people who might reply, builds it.
What else protects your mail?
- Set up SPF, DKIM and DMARC, so providers can tell the mail really comes from you.
- Keep bounces low by checking addresses before you send.
- Make it easy to stop hearing from you.
Some services "warm up" a mailbox by trading automatic emails with other mailboxes. Providers know about these networks, and the trust they build is shaky. Real, wanted mail at a steady pace is safer.
How does Propel handle it?
Each mailbox you connect has a daily limit, and sends are spaced out rather than fired at once. Propel can check your domain's SPF, DKIM and DMARC on request, and skips addresses that bounced or asked not to be contacted. See the guide Connect a mailbox and send safely and Get customers.