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Some of our clients are administrators who need to send corporative messages to no more than 300 clients, specifying all of these clients together in the "To:" fields, instead of individual messages for each one. After that, postfix will "adjust" the message in order to delivery separate messages with only one "To:" recipients each.

So, I want to configure anvil parameters, taking into account this type of requirements for detecting compromised accounts. My doubt is, does Postfix consider an email of such characteristics (300 recipients) as only one "delivery requests"? (specifically, from the point of view of the smtpd_client_message_rate_limit).

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My doubt is, does Postfix consider an email of such characteristics (300 recipients) as only one "delivery requests"?

Yes. In fact, the default limit of recipient per delivery request is 1000. See postconf smtpd_recipient_limit and the man page

If you want limit recipient, use smtpd_client_recipient_rate_limit.

A little note from this page

IMPORTANT: These limits must not be used to regulate legitimate traffic: mail will suffer grotesque delays if you do so. The limits are designed to protect the smtpd(8) server against abuse by out-of-control clients.

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