Well, it seems that my ISP recently implemented a new policy of blocking all port 25 traffic except to their servers. I'm now using port 465 (smtps) with SSl and it is working. What a pain. I should have thought to see if any traffic was even reaching the server before checking the server's...
I'm embarassed to say I just thought of trying that last night and monitor tcpdump (new tool to me).
Nothing . . . not a single packet is even getting to the server. I'm going to call my ISP and ask if they're filtering port 25 to certain domains. This is looking more like the case at the...
I have a co-located server running postfix as the mailer. I've configured postfix for SASL auth. It worked as I expected for a while. Then for no reason I've been able to detect, I was no longer able to send mail from home, but I still could from work. My guess is that postfix is somehow...
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