Sieve script issue after migrating 3.0.5.4p8 to 3.1.5 and courier to dovecot

I migrated from ispconfig 3.0.5.4p8 to 3.1.5 using the ispconfig migration tool. I also migrated from courier to dovecot. Worked like a charm. But something is wrong with sieve, I am getting following error messages since then:

In the /var/log/mail.log

Code:

Jul 15 13:56:35 mars dovecot: lda([email protected]): sieve: failed to compile script /var/vmail/example.com/foo/.sieve;name=main script (view user logfile /var/vmail/example.com/foo/.sieve.log for more information)

Sieve log at /var/vmail/example.com/foo/.sieve.log

Code:

sieve: info: started log at Jul 15 13:56:35.
main script: line 12: error: expecting test identifier after '(' in test list, but found '/'.
main script: line 12: error: unexpected character(s) starting with '^'.
main script: line 12: error: unexpected character(s) starting with '.'.
main script: line 13: error: failed to accept more tests for command 'if'.
main script: error: parse failed.

Sieve script at /var/vmail/example.com/foo/sieve (first 18 lines)

Code:

require ["fileinto", "regex", "date", "relational", "vacation"];


# Move spam to spam folder
if header :contains "X-Spam-Flag" "YES" {
  fileinto "Junk";
  # Stop here so that we do not reply on spams
  stop;
}

### BEGIN FILTER_ID:23
if (/^Subject: .*pharmacology/:h)
{
exception {
to /dev/null
}
}
### END FILTER_ID:23

Did someone encounter something similar ? How can i fix it ? Seems like the error is only thrown on migrated mail accounts. Accounts created in ispconfig 3.1.5 work without any issues.

 

Yes, it is set to sieve.

 

Unfortunately after the mailfilter resync the error still gets thrown. I also restarted the server ...