Am 11.06.26 um 11:01 schrieb TheMadHacker Schism via tor-relays:
be sure to block any and all ports for smtp, 25, 465, 587, 2525 (not a comprehensive list of ports) for both incoming and outgoing connections.
Please read the SMTP RFCs. 25 is for unauthenticated mail and if that is allowed, it can be used as a spambot. 465 and 587 are for authenticated mail. If the user does not have credentials on the remote server, it cannot send mail.
2525 is not standardized at all for mail.Exclude port 25 in the ExitPolicy, not only the firewall. Otherwise your relay might end as a Bad one.
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