Port 25 is also used for receiving mail. My guess is your ISP blocked port 25 for incoming connections due to someone using your postfix for relaying spam. ----- Original Message ----- From: "Tom Horsley" <tom.horsley@xxxxxxx> To: "Fedora List" <fedora-list@xxxxxxxxxx> Sent: Thursday, May 14, 2009 2:37:51 AM GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna Subject: comcast, port 25, and postfix? I'm running postfix rather than sendmail, and I have it setup to use a relayhost to send mail via my ISP through a stunnel SSL connection. I just got mail from comcast telling me they have blocked port 25 on my cablemodem due to possible abuse (I don't really care if they do this - I'm not using port 25). Just curious: Anyone know if postfix will try to talk port 25 for any reason if I've got it configured to send via the relay? Or is this just comcast trying to sound like they have a good reason to do what they always wanted to do and block smtp :-)? Or are there maybe obscure kerneloops or smolt or bugbuddy things trying to talk port 25 directly sometimes? I've never noticed any port 25 activity in wireshark when monitoring interfaces while sending mail. -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
