reply to n0xlf
Re: Comcast blocked port 25 (SMTP)??? It seems very obvious to me that an APC SmartUPS which sends self-test emails once a week (1 that the test started, then shortly after 1 that the test completed ok or not) was "way too much" email, such that it triggers the SMTP block on Comcast connections.
...this has happened to me at about 20+ customers...
As such, I prefer to follow the rule of thumb that you shouldn't rely on port 25 on Comcast for any reason, because they can/will shut it off on a whim :-/
My solution in these cases is to setup a local SMTP server that uses gmail as the smarthost, therefor mail goes out over the more reliable port 587 or 465