Mailbox can not be created on a Plesk for Windows server: Unable to update the mail account properties: mailmng failed: MEAOPO.Mailbox.AddMailbox failed for name=jdoe and domain example.com

Symptoms

• When creating a mailbox jdoe@example.com on a Plesk for Windows server, the following error is provided:

  PLESK_ERROR: An error occurred during mail account creation: Unable to update the mail account properties: mailmng failed: MEAOAU.Login.AddLogin failed for name=jdoe and domain example.com [example.com]
  at (MailEnable::MailEnableMailName::MailEnableMailName line 43)
  at Unable to execute console command: '--add-mailname'(vconsoleapp::start line 95)
  at Unable to execute command: '"C:\Program Files (x86)\Plesk\admin\bin\mailmng" --add-mailname "--domain-name=example.com" "--mailname=jdoe"'(vconsoleapp::run line 117)
  (Error code 1)
  exit status 1

• Migration of the domains with mailboxes to this server fails with a similar error.

• After creation, the mailbox appears in MailEnable > Messaging Manager > Post Offices > example.com > Mailboxes, and it is marked with the red stop sign. In an attempt to open its properties the error below is provided:

  CONFIG_TEXT: Error
  Failed to get password entry from authentication configuration store. An entry will be created for you with a random password to fix this error. You should enter a new password when possible.

• MailEnable Enterprise Edition is installed on the server.

Cause

Too strict security settings in MailEnable Enterprise edition.
Such behavior was confirmed as Plesk bug with ID PPPM-11921 and Plesk Migrator extension bug with ID PMT-4837.

Resolution

1. Log into Plesk.

2. Go to Domains > example.com > Mail tab > Mail Accounts and remove the affected mailbox jdoe@example.com from Plesk.

3. Connect to the server via RDP.

4. Open MailEnable > Servers > right-click on localhost > in the opened window switch to the Policies tab > disable the options Lock out user for one hour after and Enforce password policy and apply changes:
   

5. Re-create mailbox in Plesk.

6. For migration cases, additionally, re-migrate the affected subscription as per the following article.