From: /dev/rob0 (rob0gmx.co.uk)
Date: Thu Feb 10 2005 - 00:17:25 CST

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On Wednesday 09 February 2005 00:20, Norman Zhang wrote:
> unknown[207.34.136.14]: SASL LOGIN authentication failed
>
> eventhough I can sendmail without problem. May I for a few pointers?

$html_directory/postconf.5.html#smtpd_sender_restrictions
reject_unauthenticated_sender_login_mismatch
reject_sender_login_mismatch

Also:
$ host -t MX rd.arkonnetworks.com.
rd.arkonnetworks.com mail is handled by 10 mail.gw.arkonnetworks.com.
$ host mail.gw.arkonnetworks.com.
mail.gw.arkonnetworks.com has address 207.34.136.11

It appears that you might trying this from the same /30 netblock. If
207.34.136.14 is in $mynetworks, you're allowed to relay from there by
default. You need to have a restriction in place which will NOT allow
you to relay. This can be done simply by placing
reject_sender_login_mismatch before permit_mynetworks in
smtpd_sender_restrictions or smtpd_recipient_restrictions.
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