SMTP Error only with SOME MAil Clients but not with Outlook

[Metapro]

Maybe someone could help me with this crazy authentification problem:

With outlook and smtp authentification is sending via SMTP possible.

With programs, like tobit david or mozilla thunderbird the server stops login with an authentification error like: This Server needs Auth...

But this is activated!

The POP3 Access (with same password) is problem free.

I can't find the problem - why does outlook work with smtp and the other mail clients not?

In Plesk nothing is black listed and authentification is enabled.

Please could anyone help me to locate the error?

 

[cviviani]

Importend for gemail, foxmail pegasus,etc mail users.
with outlook express and incredimail it works without any change

If you go in the MailEnable MMC > Servers > Connectors, right click on the SMTP connector and click on Properties, click the Relay TAB and uncheck Allow Relay for Privileged IP ranges, or add the IP's you want to enable to relay. I disabled it, and it works fine now.


http://forum.sw-soft.com/showthread.php?threadid=16607

 

[Metapro]

I can't believe it - this was really the problem! I never had found this!

So let me give you a huge virtual chocolate Santa....