Hello,
since I upgraded to Plesk 11.5 each time the panel updates with microupdates i noticed that smtp auth on port 587 does not work, on email client it keeps prompting for password and in maillog file it only appears as AUTH FAILED. The smtp auth on port 25 works as expected but some of our customers have the port 25 blocked by their ISP to prevent SPAM abuse and need to use 587. At this point the only way I have to make it work again is reconfigure mail settings with mchk like said in http://kb.parallels.com/en/944 (I run /usr/local/psa/admin/sbin/mchk --with-spam ) and just after it completes the customers can send again on port 587.
since I upgraded to Plesk 11.5 each time the panel updates with microupdates i noticed that smtp auth on port 587 does not work, on email client it keeps prompting for password and in maillog file it only appears as AUTH FAILED. The smtp auth on port 25 works as expected but some of our customers have the port 25 blocked by their ISP to prevent SPAM abuse and need to use 587. At this point the only way I have to make it work again is reconfigure mail settings with mchk like said in http://kb.parallels.com/en/944 (I run /usr/local/psa/admin/sbin/mchk --with-spam ) and just after it completes the customers can send again on port 587.