An attempt to create or manage an email account fails with the following error:
unable to update the mail account properties. Can't open domain. Domain domain.tld. Reason failed to login (Error code 1)
Synchronization issue between mail server and Plesk.
"%plesk_bin%\\mchk.exe" --domain --domain-name=domain.tld --fix=local
If you use SmarterMail and the issue persists, please try the solution described in the # 118961 article.