ChangeIP.com Forums

I use changeip.com Dynamic SMTP feature for 2 domains I have and it works like a charm.

Now what I want to do is to use my Postfix server to configure changeip.com's servers as a relayhost.

However, once I've changed the configuration of my postfix and tried to send the test email - I've got it bounced back "we do not relay domain for domain.com".

I couldn't find any docs here about authentication - does changeip.com uses any kind of authentication to relay mail? If yes, which one?

Thx, Serge.

Hello,

we use standard 'smtp authentication' (Your email address is the username and the password) as well as pop before smtp. I believe postfix can do the smtp auth - although I am not sure how to set it up. If you can find something on how to setup smtp auth I'd appreciate if you could post a link to it here so others can use the info.

Thx,
Sam

I was actually talking about mail server to mail server relay. e.g. I connect to my server to send the email which is being relayed to changeip.com's mailserver and after that it goes to it's final destination.

Is there a way to setup some kind of passwd-auth for server to server and not via email as userid/passwd? In that case every new user will have to be added to SASL configuration.

Thx, Serge.

We have many users using server to server communications. Usually what they do is setup an email address called 'relay@example.org' - and make it a large mailbox. The sending mail server will smtp auth with our servers using that user/pass combination and then it will be allowed to send using *@example.org. The from address does not have to match the account setup - the domain simply has to exist on the servers to be used as a from address.

Postfix should have some way to use smtp auth to send mail with. Your users can use postfix as their smtp server, postfix then uses us as the smtp relay - and all gets put under the quota limits from the 'relay@example.org' user that you setup. Just make sure that your server is not an open relay or you will hit your quota limits very quickly! Our server will say 'we do not relay' if you do not authenticate. Our server will say 'we do not relay, account limits apply' if you have gone over your quota.

Does that help? Let me know.

Thx,
Sam

See here for postfix smtp auth... i think this is what you are looking for:

http://postfix.state-of-mind.de/patrick.koetter/smtpauth/smtp_auth_mailservers.html

Yup, that explains things.

Thx, Serge.