On 2012-01-24 6:51 AM, Jacek Osiecki joshua@hybrid.pl wrote:
On Tue, 24 Jan 2012, Charles Marcus wrote:
On 2012-01-23 11:14 AM, Noel noeldude@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...
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Best regards,
Charles