[Trisquel-users] Re : How do I set up a mail server?

[mtlben]

A problem that you might have is if your ISP blocks port 25.  You can check  
for yourself at: http://www.canyouseeme.org/

I am able to run a small webserver at home eventhough my ISP blocks port 80  
(I use a non standard port instead).  However, I haven't found a way to run a  
mail server if port 25 is blocked :(.  There may be ways (see  
http://www.noip.com/managed-mail) if you're willing to pay, though.