Safe Daily Sending Limits for Cold Email by Domain Age

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Every place a page here uses this source, in the order the words come in it.

1. What "engagement" actually means here: “For cold email, engagement is mostly about replies and non-bounces.” Signs you're sending too much too soon:

   In Engagement-based deliverability

2. Signs you're sending too much too soon: “Rate-limiting errors from your sending provider” Emails landing in spam that previously hit the inbox

   In Sending rate and volume controls

3. What "engagement" actually means here: “Any spam complaints at all should make you pause and reassess your list quality.” Signs you're sending too much too soon:

   In Spam complaint management

4. Still have a question, spotted an error, or have a better explanation or a source we should cite? “A lot of cold emailers ask "how many emails can I send per day?" when the real question is "how many can I send without burning my domain?"” The limits below are conservative on purpose. Your domain's reputation is the asset you're protecting. Build it slowly and you can scale. Rush it and you'll spend weeks recovering.

   In Mailbox sending capacity

5. Still have a question, spotted an error, or have a better explanation or a source we should cite? “Those are very different numbers.” The limits below are conservative on purpose. Your domain's reputation is the asset you're protecting. Build it slowly and you can scale. Rush it and you'll spend weeks recovering.

   In Mailbox sending capacity

6. Established domain with solid reputation: 75 to 150 emails per day. This is a ceiling for most cold outreach, not a target. “If you're sending from multiple inboxes on one domain, these limits apply across the whole domain, not per inbox.” What about provider technical limits?

   In Mailbox sending capacity

7. Recommended daily sending limits by domain stage: “New domain (weeks 1 to 2): 10 to 30 emails per day. No exceptions.” Warming domain (weeks 3 to 6): 30 to 75 emails per day. Increase only if your engagement looks healthy (more on that below).

   In Mailbox sending capacity

8. New domain (weeks 1 to 2): 10 to 30 emails per day. No exceptions. New domains have zero reputation history, and mailbox providers are watching closely. “Warming domain (weeks 3 to 6): 30 to 75 emails per day. Increase only if your engagement looks healthy (more on that below).” Established domain with solid reputation: 75 to 150 emails per day. This is a ceiling for most cold outreach, not a target.

   In Mailbox sending capacity

9. Warming domain (weeks 3 to 6): 30 to 75 emails per day. Increase only if your engagement looks healthy (more on that below). “Established domain with solid reputation: 75 to 150 emails per day. This is a ceiling for most cold outreach, not a target.” If you're sending from multiple inboxes on one domain, these limits apply across the whole domain, not per inbox. Splitting 200 emails across four inboxes doesn't fool anyone.

   In Mailbox sending capacity

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