Protection from Outgoing Spam - Error

[MoritzKK]

I have some error when the new outgoing spam protection (limitation for outgoing mail) is enabled. Mail clients are unable to use SMTP for sending mails. "My mail client says: The message could not be sent. You are not allowed to use sendmail utility."

I don't undestand the blocking behaviour since the checkbox "Allow scripts and users to use Sendmail" is checked and no limit is exeeded.

This is the relevant log part of maillog:

Jul  3 00:44:36 srv01 postfix/smtpd[3326]: C0E5182A20: client=46.128.x.x.dynamic.cablesurf.de[46.128.x.x], sasl_method=CRAM-MD5, [email protected]
Jul  3 00:44:36 srv01 postfix/cleanup[3331]: C0E5182A20: message-id=<[email protected]>
Jul  3 00:44:37 srv01 /usr/lib/plesk-9.0/psa-pc-remote[3280]: handlers_stderr: DATA REPLY:554:[B]5.7.0 The message could not be sent. You are not allowed to use sendmail utility.[/B] REJECT
Jul  3 00:44:37 srv01 /usr/lib/plesk-9.0/psa-pc-remote[3280]: REJECT during call 'limit-out' handler
Jul  3 00:44:37 srv01 postfix/cleanup[3331]: C0E5182A20: milter-reject: END-OF-MESSAGE from 46.128.213.43.dynamic.cablesurf.de[46.128.x.x]: 5.7.0 The message could not be sent. You are not allowed to use sendmail utility.; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<[192.168.1.20]>
Jul  3 00:44:37 srv01 postfix/smtpd[3326]: disconnect from 46.128.x.x.dynamic.cablesurf.de[46.128.x.x]

Moreover I disabled the line "non_smtpd_milters" in postfix main.conf since my server has same issues discribed in the following thread:
Postfix: mails sent through sendmail binary are blocked because of wrong HELO

 

[Stefan Becker]

I've the same problem, too :-(