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0 pointsjudge20202y ago0 comments

Wouldn't it be based on send volume from your domain, and not send volume via your sending IP / smarthost?

0 comments

Usually when talking about spam filtering it's based on sending IP and not domain names (domains are still important, but IP addresses are usually the first thing that is being evaluated), although admittedly Google is vague on what constitutes "5,000 mails per day".

judge2020OP2y ago

The linked article points to blog.google which points to this support article https://support.google.com/mail/answer/81126 which then finally points to this article: https://support.google.com/a/answer/14229414

> What is a bulk sender?

> A bulk sender is any email sender that sends close to 5,000 or more messages to personal Gmail accounts within a 24-hour period. Messages sent from the same primary domain count toward the 5,000 limit.

> Sending domains: When we calculate the 5,000-message limit, we count all messages sent from the same primary domain. For example, every day you send 2,500 messages from solarmora.com and 2,500 messages from promotions.solarmora.com to personal Gmail accounts. You’re considered a bulk sender because all 5,000 messages were sent from the same primary domain: solarmora.com. Learn about domain name basics.

> Senders who meet the above criteria at least once are permanently considered bulk senders.

IMO this is better since they have to handle all of the personal domains and small communities that send from a SMTP service like Sendgrid or Amazon SES. Relying on IPv4s to not be shared wouldn't work universally.

xyzzy1232y ago

It would also allow a pretty trivial bypass using ipv6. A sizeable % of ip-based rate limits are breakable if you can use v6; iirc for a long time google web properties had bypassable rate limits if you knew about this.

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