ISP filtering port 25

Ben Walton bdwalton-Re5JQEeQqe8AvxtiuMwx3w at
Sun Mar 16 08:03:41 UTC 2014

This implies that you're trying to send mail either directly from your
machine to the world or are using a non-ISP provided mail service.

If it's the former stop it. :)

You really don't want to do direct to port 25 unless you're a proper mail
server. If you're doing this on your home internet connection, you don't

If it's the latter, I recommend doing this for many reasons. Any mail
service provider worth using will listen on TCP/587 and require TLS+auth
for outbound relay through this port.

(I used to feel quite indignant about this myself. A few years of dealing
with the type of crap that originates from ISP networks running a mail
service that people cared about changed this view.)

On Mar 16, 2014 2:49 AM, "Marc Lijour" <marclijour-Re5JQEeQqe8AvxtiuMwx3w at> wrote:

> Hello,
> I moved to a new ISP that is clearly filtering traffic going out to port
> 25.
> Is there a way around this? Do I have to change ISP or is there hope?
> I bet many of you have their own mail servers out there.
> Marc
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