Sending volume
How much mail a sender sends, per day and per provider. Providers judge changes in volume as much as the level, so steady growth matters.
What it means
Google's guidelines tie volume to reputation: the more you send, the more slowly you should increase it, and you can increase faster when you send daily rather than weekly. It recommends a consistent rate without bursts, and gives an example of what goes wrong: immediately doubling previously sent volumes can lead to rate limiting or reputation drops. A change in message format or sending infrastructure should be ramped up separately.
M3AAWG notes that IP reputation is sensitive to changes in volume, and its practices for ESPs flag a customer sending more than 40% above its usual volume as abnormal.
Volume also sets which rules apply: Google's and Microsoft's bulk requirements start at 5,000 messages a day to their users.
Related terms
On this site
Sources
What this definition rests on. The wording is ours; the facts are theirs.
- Google: Email sender guidelinessupport.google.com
- M3AAWG Sender Best Common Practices, version 4.0 (August 2026)m3aawg.org
- Google: Email sender guidelines FAQsupport.google.com
- Microsoft Tech Community: Outlook's requirements for high-volume senderstechcommunity.microsoft.com
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