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Come to think of it, I've never looked at inbound stuff. You'd think outbound would be where all the spam problems come from, though.
by doctorohhnoes 13y ago
Come to think of it, I've never looked at inbound stuff. You'd think outbound would be where all the spam problems come from, though.
- sliverstorm 13y agoIf you block 25 outbound, people's mail clients (Outlook, Thunderbird, etc) could not deliver mail to servers that don't run SSL or TLS (465, 587)
- werid 13y agoLots of ISPs does this. They require you to relay via their SMTP-server.
- daigoba66 13y agoUsed to have Bellsouth DSL, and they did this. SMTP/TLS on a different port worked though. But obviously you couldn't run your own e-mail server.
- ckuehl 13y agoIdeally you would use port 587, which is the designated port for mail submission. See RFC 2476 [1]. This requires that your mail provider supports that port, of course, which is unfortunately not always the case. [1] http://www.ietf.org/rfc/rfc2476.txt http://www.ietf.org/rfc/rfc2476.txt
- pyre 13y ago> You'd think outbound would be where all the spam problems come from, though. They block port 25 to prevent open relays on their network (i.e. someone sends a forged email, the SMTP server does no authentication, and just forwards it on to the destination).