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> Optional and Restrictive SMTP Auth, The Difference is important!
hschneider
Posted: Nov 28 2002, 07:44 PM
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When it comes to SMTP AUTH, we have to differ 2 different settings:

RESTRICTIVE SMTP AUTH:
- Enable "SmtpConfig" "mail-auth" in your server.tab
- Enable SMTP Authentication on your client
- This makes your system private to your domain users only other SMTP's cannot send
mail to your server, because they cannot authenticate.
- If you send mail to other SMTP servers, they might blacklist you as a private spam server.
- Enabling RESTRICTIVE SMTP AUTH is generally a bad idea.

OPTIONAL SMTP AUTH:
- Disable "SmtpConfig" "mail-auth" in your server.tab
- Clear smtprelay.tab or limit it to your LAN, only.
- Enable SMTP Authentication on your client
- Even when you have disabled "mail-auth" in your server.tab, XMail accepts client requests for SMTP Auth.
- This won't get your server marked as a spam server ...
- ... and other SMTP's can deliver mail to your system without authentication.

So if you disable POP_BEFORE_SMTP (with "EnableAuthSMTP-POP3" "0" in your server.tab) and use OPTIONAL SMTP AUTH, you deny relaying and force your own users to authenticate.

Thanks to Andrew Joakimsen for that hint!


--------------------
Bye,
Harald


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