Yet another "553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)"

[Jusic]

Hi,

after upgrading to Plesk 9 I have a Problem. Sending Mail over Mozilla Thunderbird works fine but when I use Webmail (Horde, AtMail, Squirrelmail) I get the Error Message "553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)".
http://forum.swsoft.com/showthread.php?t=52560&page=3 Didn't help.

Yours sincerly
Jusic

 

[JaredEarle]

Have you added all the IPs to the whitelist, including any created by VPNs?

 

[Jusic]

Switched from QMail to Postfix without changing anything else. Now everything works fine again.