Hi,
we're providing a small smtp sent-service for our customers (via submission port / auth only - postfix). ~ 7.000 outgoing mails / day (via 2 hosts in different data centers/ip networks). As the amount of mails increase, we would like to be ready for - stolen auth-data to our service is used for sending spam - broken clients send thousand of mails/minute - one of our pub-ips get blacklisted / rerouting traffic? - ISPs block our complete provider networks (and we are included) - Perm-blocks with 5xx, always return all 5xx to senders? How do you guys prepare yourself for this? we have in place: only allow pre-defined sender-addresses after auth monitor mail-queues for high connection count monitor RBLs if we're listed only allow single mail / 5s to be sent outgoing anti-virus checking of attachments Would be awesome to get some insight how "big sites" handle this and maybe other cases. Thank you! Stefan
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