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тАО05-28-2008 08:03 AM
тАО05-28-2008 08:03 AM
sendmail configuration issue with non-standard SMTP port
What changes would I need to make to sendmail.cf or other files to make this work?
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тАО05-28-2008 10:30 AM
тАО05-28-2008 10:30 AM
Re: sendmail configuration issue with non-standard SMTP port
Inbound or outbound?
IF its outbound, you might just want to have iptables firewall do a bit of port forwarding.
Otherwise you need to change sendmail.mc and muse m4 to compile a new sendmail.cf
sendmail.cf is not human readable IMO, sendmail.mc is.
http://www.sendmail.org
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тАО05-28-2008 10:32 AM
тАО05-28-2008 10:32 AM
Re: sendmail configuration issue with non-standard SMTP port
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тАО05-28-2008 12:44 PM
тАО05-28-2008 12:44 PM
Re: sendmail configuration issue with non-standard SMTP port
http://wiki.xdroop.com/space/sendmail/smart+host+ports
Normally, your firewall won't block outgoing packets.
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тАО05-29-2008 09:04 AM
тАО05-29-2008 09:04 AM
Re: sendmail configuration issue with non-standard SMTP port
iptables -t nat -A OUTPUT -p tcp -d mail.server.ip.addr --dport 25 --to-destination mail.server.ip.addr:8080 -j DNAT
This redirects any outgoing TCP connection to the mail server's port 25 to the port 8080 instead. Connection tracking is automatically invoked to ensure any returning packets are modified too, so the applications at either end can work just as usual.
In the viewpoint of any program on this host, including Sendmail, that particular mail server is now effectively running on port 25, not 8080.
Of course, this is just one of the many ways to skin this particular cat...
Note that this is a "nat" rule, not the usual "filter" rule, so a simple "iptables -L" won't display it. You'll need to use "iptables -t nat -L" to see it.
MK