Resolved Webmail Problem

[MarcusR]

Hey @ all,
running into problems by unsing Horde or Roundcube. Very slow. Horde runs into => End of script output before headers: ajax.php . Roundcube says: Message not send ( but it is ;-) ) These happens on 3 different servers w/Plesk 17.5.3 and Debian 8. dovecot and qmail !!! Debian 7.11 Plesk 12.0.18 works smooth.

Anyone any idea?

regards
marcus

 

[IgorG]

I would first look at the related errors in the log files of webmails.

 

[MarcusR]

already done .... nothing found...

disable DNSBL-Service was the key! In detail - remove zen.spamhaus - now everything is solved.