Am 02.01.2026 um 10:31:03 Uhr schrieb Christof Meerwald via mailop: > On Fri, Jan 02, 2026 at 10:15:45AM +0100, Michael Grimm via mailop > wrote: > > From https://docs.hetzner.com/cloud/servers/faq: > > > > "That's why we block ports 25 and 465 by default on all cloud > > servers." > > What could be the reason to block port 465 (and then not also block > port 587)?
IIRC Microsoft products used that for SMTP over TLS (unauthenticated, not submission), so some servers had that opened and accepted mail without authentication from everywhere, which made spammers use that to send spam to the MX. Now 465 is reserved for submissions according to IANA. -- Gruß Marco Send unsolicited bulk mail to [email protected]
pgp0aG5Bh1ENF.pgp
Description: Digitale Signatur von OpenPGP
_______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
