[Cialug] Qwest subtly filtering port 25

[David Champion]

Use port 487, which is for SMTP Submission.

-dc

On Fri, May 27, 2011 at 4:18 PM, Tim Perdue <cialug at perdue.net> wrote:

> Not sure if anyone else ran into this, but it had me vexed all week. I have
> used thunderbird for years from home to relay off an outside server and it
> just quit working and starting giving an error about SMTP timeout.
>
> Turns out Qwest has done some sort of subtle blocking of port 25 that
> causes SMTP to timeout, although the port appears to be open (you can telnet
> to it).
>
> http://mikedopp.com/2011/bold-move-from-qwest-to-block-port-25-traffic/
>
> A call to tech support got them to drop the filtering within a few minutes
> and my email works again.
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