Permanent getmail postfix error

[dynamind]

Hello,

since 2 weeks I'm in trouble with fetchmail, no matter what I tried, it did not fix this issue:

Oct 1 18:39:06 ws postfix/smtp[26324]: warning: host mail.my-domain.com[XX.XX.XXX.XXX]:25 greeted me with my own hostname mail.my-domain.com
Oct 1 18:39:06 ws postfix/smtp[26324]: warning: host mail.my-domain.com[XX.XX.XXX.XXX]:25 replied to HELO/EHLO with my own hostname mail.my-domain.com
Oct 1 18:39:07 ws postfix/smtp[26324]: warning: host mail.my-domain.com[XX.XX.XXX.XXX]:25 greeted me with my own hostname mail.my-domain.com
Oct 1 18:39:07 ws postfix/smtp[26324]: warning: host mail.my-domain.com[XX.XX.XXX.XXX]:25 replied to HELO/EHLO with my own hostname mail.my-domain.com
Oct 1 18:40:06 ws getmail: getmailOperationError error (POP error (-ERR Login failed.))
Oct 1 18:40:11 ws getmail: getmailOperationError error (POP error (-ERR Login failed.))
Oct 1 18:40:16 ws getmail: getmailOperationError error (POP error (-ERR Login failed.))
Oct 1 18:40:22 ws getmail: getmailOperationError error (POP error (-ERR Login failed.))

In a thread here I found settings in /etc/mailname should fix this problem, but it did not for me.
I checked the login credentials with thunderbird, everything works as it should with the mailclient.
I own a bunch of bloated logs now ; )
ISPconfig version is 3.0.4.6 - any suggestions?

regards, dynamind