ISP filtering port 25

Marc Lijour marc-bbkyySd1vPWsTnJN9+BGXg at
Mon Mar 17 02:08:24 UTC 2014

Talking to ISP support is useless. Google does a better job at providing
a solution.

Anyhow, I found a solution to my problem. It was as simple as telling
postfix to listen to port 465 with sasl authentication. Port 465 is not
filtered. Now I can send email from any port  25-filtered network.

On 16/03/14 04:03 AM, Ben Walton wrote:-
> 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 count.
> 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.)
> Thanks
> -Ben
> On Mar 16, 2014 2:49 AM, "Marc Lijour" <marclijour-Re5JQEeQqe8AvxtiuMwx3w at
> <mailto:marclijour-Re5JQEeQqe8AvxtiuMwx3w at>> wrote:
>     Hello,
>     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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