How to configure sendmail to go through a proxy server

[Debbie Fleith]

We usually can get by with the default config of sendmail. Not now. How do I configure sendmail to go through a proxy server, at port 8080?

[Steven E. Protter · Accepted solution]

Shalom,

Few issues.

1) The proxy server is going to have to take its traffic for outbound mail on port 8080 and transfer it to port 25 if you expect any of your outbound mail to actucally get delivered.

2) For inbound mail its open port 25 or don't get any.

Take a look at the sendmail.mc file and how to customize the configuration on http://www.sendmail.org

It is possible to route outbound mail through another port but the proxy server's going to have to change the outbound traffic to port 25 anyway.

Much better to have an smtp relay server on the proxy server or some other box and let it relay the mail. Then the sendmail DS directive will let you relay outbound mail through that system.

SEP

[Ivan Ferreira]

Proxy normally don't forward SMTP traffic. You must send the mail to a smart host.