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Full Discussion: Alternative to Port 25
Special Forums IP Networking Alternative to Port 25 Post 302306816 by sdotsen on Monday 13th of April 2009 11:21:40 PM
Old 04-14-2009
Alternative to Port 25

We're in the process of testing a mail server that we hope will replace our current one that's being hosted by our ISP. We learned a few things along the way and would like to avoid them if possible. The biggest hurdle is getting around port 25 (SMTP). Our work force is approx 75% consultants who work from clients' sites. Many of these places block port 25, therefore our users can't connect to send emails.

I know it varies from site to site depending on what their IT dept puts in place, but is there a range of port that's safe to use? I know comcast blocks port 25 but I read there's a workaround with using port 587 to get around this. For those who have dealt with this, what solution did you come up with?
 

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solid-pop3d(8)						   System Administrator's Manual					    solid-pop3d(8)

NAME
solid-pop3d - The Solid POP3 Server SYNOPSIS
solid-pop3d [-rd] [-n maildropfile] [-t maildroptype] [-a time] [-f configfile] DESCRIPTION
The Solid POP3 Server is an implementation of the Post Office Protocol server that has flexibility on mind. It has support for mailbox, maildir, APOP, bulletins and few other things. It can work as inetd or standalone server. See README for more details. OPTIONS
-n maildropfile Specify a maildrop file (or directory). The following strings beginning with % character are recognized and replaced: %s replace it with user name %dN replace it with N-th character of user name %% replace it with single % character %m replace it with mapped user name (read VIRTUALS file) %o replace it with the "original" user name. This is the user name with any UserMapPrefix removed. Unless DoMapping is enabled, and a UserMapPrefix is supplied, this will be a blank string. If specified path is not absolute it is treated as relative to user home directory. For example: /var/mail/%d1/%d2/%s is expanded to /var/mail/j/u/jurekb and Mail/bugtraq is expanded to /home/jurekb/Mail/bugtraq for "jurekb" user on my system. The default is /var/mail/%s or Maildir when mailbox support is not compiled in. -t maildroptype Specify a maildrop type. mailbox and maildir are supported. The default is mailbox or maildir when mailbox support is not compiled in. -a time Specify an autologout time. The following suffixes are recognized: s the time is specified in seconds m the time is specified in minutes h the time is specified in hours d the time is specified in days w the time is specified in weeks Seconds are used if no suffix is present. The default value is 2 minutes. -f configfile Specify a configuration file. The default is /etc/spop3d.conf -d Set server into debugging mode. -r Allow root login. This feature is disabled by default and shouldn't be used. FILES
~/.spop3d User configuration file. ~/.spop3d-bull This file is used by bulletin code to determine last bulletin received by user. /var/lib/solid-pop3d/bulletins Bulletins directory. /etc/spop3d.conf Global configuration file. SEE ALSO
spop3d.conf(5), pop_auth(1), dot-spop3d(5), AUTHOR
Jerzy Balamut <jurekb@dione.ids.pl> Unix OCTOBER 1999 solid-pop3d(8)
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