[Dovecot] change smtp port

[Amira Othman]

Thanks for reply

The problem that ISP for some reason port 25 is not stable and refuse
connection for several times so I tried to change port to 587 instead of 25
to keep sending emails. And I though that I can stop using port 25 as it's
not always working from ISP

-----Original Message-----
From: dovecot-bounces at dovecot.org [mailto:dovecot-bounces at dovecot.org] On
Behalf Of Charles Marcus
Sent: Tuesday, January 24, 2012 2:19 PM
To: dovecot at dovecot.org
Subject: Re: [Dovecot] change smtp port

On 2012-01-24 6:51 AM, Jacek Osiecki <joshua at hybrid.pl> wrote:
> On Tue, 24 Jan 2012, Charles Marcus wrote:
>> On 2012-01-23 11:14 AM, Noel <noeldude at gmail.com> wrote:
>>> If your problem is that your Internet Service Provider is blocking
>>> port 25, you can contact them. Some ISPs will unblock port 25 on
>>> request, or might even have an online form you can fill out.

>> The OP specifically said that *he* had changed the port from 25 to
>> 587... obviously he doesn't understand how smtp works...

> Most probably he wanted to enable his users to send emails via his mail
> server using port 587, because some may have blocked access to port 25.

Which obviously means he has not even a basic understanding of how smtp 
works.

> Proper solution is to open additionally port 587 and require users to
> authenticate in order to send mails through the server. If it is too
> complicated in postfix,

Which is precisely why I (and a few others) gave him those instructions...

> admin can simply map port 587 to 25 - most probably that would work well.

Of course it will work... but it is most definitely *not* recommended, 
and not only that, will totally defeat achieving the goal of using the 
submission port (because *all* port 587 traffic would be routed to port 
25)... I only mentioned that this could be done in answer to someone who 
said it couldn't...

-- 

Best regards,

Charles