Bulk sender
A bulk sender, in Gmail's rules, is anyone who sends more than 5,000 messages a day to Gmail accounts.
Since February 2024, Gmail has stricter rules for bulk senders. They must set up SPF, DKIM and DMARC, offer one-click unsubscribe on marketing email, and keep their spam complaint rate below 0.3%.
Most founders are far below 5,000 a day. Follow the same rules anyway. Gmail asks every sender to set up SPF or DKIM, and the full set protects your email deliverability. If you send cold email, warm up a second domain for it.
Go deeper
- How to warm up an email domain for cold emailWarm up an email domain for cold email: buy 5 separate domains, set up 15 mailboxes with SPF, DKIM and DMARC, send only warm emails for 2 weeks, then climb from 10 to 30 a day per mailbox to reach 100 new people a day.
- How to grow a newsletter from scratchGrow a newsletter from scratch with no audience and no budget: one clear line on who it is for, a free beehiiv signup page, 100 personal invitations and 2 posts a day, recommendation swaps, and a Sunday count of replies and new readers.
What links here
Sources
- Email sender guidelines, Gmail Help, checked 24 September 2026
Last checked 24 September 2026.