I have an an email server running Postfix on a T1 connection to relay through. I use Postfix. Sendmail, qmail, exim, etc. ought to
work similarly. Details are left as an exercise for the reader. ;-)
===================================
Overview:
Restricted server (on Adelphia) receives email on port 10025
Server on unrestricted network accepts email for and transports
it to restrcited server.
Change DNS MX record to send email through unrestricted server.===================================
On restricted (Adelphia) server make these changes:
Modify /etc/postfix/master.cf:
Add line:
10025 inet n - y - - smtpd
Reload postfix configuration with 'postfix reload' Test it is listening on port 10025:
telnet localhost 10025
make sure you get SMTP prompt (220 host.name ESTMP, for example)===================================
On unrestricted server make these changes:
Modify /etc/postfix/main.cf:
Add line:
transport_maps = hash:/etc/postfix/master.cf
Add to:
relay_domains = ... domain.to.relay
Note: Do NOT add to mydestinations
Add to:
smtp_recipient_restrictions = ... permit_mx_backup Modify /etc/postfix/transport:
Add line:
domain.to.relay smtp:[host.to.relay.to:10025]Run 'postmap /etc/postfix/transport' Reload postfix configuration with 'postfix reload'
=================================== Change DNS MX record for domain.to.relay to point at unrestricted server.
Note: Issues such as host.to.relay.to being a dynamic IP
are beyond the scope of this. ;-)Hope this helps someone.
-- Dan Jenkins ([EMAIL PROTECTED]) Rastech Inc., Bedford, NH, USA --- 1-603-624-7272 *** Technical Support for over a Quarter Century
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