Unable to create a mailbox: SOAP failed. No additional info

Symptoms

• Unable to create a mailbox with the error message below:

  PLESK_ERROR: SOAP failed. No additional info

  ---

  PLESK_ERROR: Unable to update the mail account properties:mailmng failed:
  SOAP ERROR: GetDomainInfo() failed: Error code 0x803d0010. Error
  message: There was an error communicating with the endpoint

• A similar error can be found in Event Viewer > Applications and Services Logs and in %plesk_dir%adminlogsphp_error.log file.
• It is not possible to send or receive mail.
• SmarterMail is used as a mail server.

• In an attempt to access Tools & Settings > Mail Server Settings the following is shown:

  PLESK_INFO: Operation Failed
  The operation you were performing failed. You can retry the operation with our without changing its parameters.

Cause

SmarterMail service is in the stopped state.

Resolution

1. Log into Plesk.
2. Go to Tools & Settings > Services Management.
3. Start SmarterMail Service by pressing the highlighted button as on the screenshot below: