[svlug] ISP blocks port 25

Walt Reed svlug at linuxguy.com
Mon Apr 16 10:46:47 PDT 2007

On Mon, Apr 16, 2007 at 10:40:38AM -0700, Daevid Vincent said:
> > I just switched my home ISP from Qwest to Bresnan 
> > on a cable modem, and also discovered they block 
> > port 25 on their home accounts so I am unable to 
> > connect to my SMTP server here in the office on 
> > port 25 to receive mail.
> > 
> > What is the most common workaround for this? Do I 
> > just move the mail server to a different port?
> http://www.dyndns.com/services/mailhop/

The best option is to use SMTP Auth on port 587, the MSA port.

Any mail server that isn't broken by design can do this out of the box
with minor configuration. I would also make sure you can run TLS on that
port too (since you are doing authentication.)

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