Unable to access mailbox or create a new one after changing the default location of mailboxes in Plesk for Linux: No such file or directory

Symptoms

• Default mailbox location was changed as per the article.

• When navigating to Domains > example.com > Mail Accounts > j_doe@example.com the following error is displayed:

  CONFIG_TEXT: Server Error
  500 PleskUtilException
  mailmng-mailname failed: Unable to open dir /new/MailDir/example.com/j_doe/@attachments: No such file or directory System error 2: No such file or directory

• A new mailbox can not be created at Domains > example.com > Mail Accounts > Created Email Address with the following error:

  PLESK_ERROR: Error: mailmng-core failed: unable to change to mbox folder /new/MailDir/example.com/jane_doe: No such file or directory
  System error 2: No such file or directory
  Fatal error: plesk::mail::FSError(unable to remove quota: No such file or directory: "/new/MailDir/example.com/jane_doe")
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Cause

A new directory to store mailboxes contain capital letters and this directory name was used accordingly in all configuration files, for example:

# grep PLESK_MAILNAMES_D /etc/psa/psa.conf
PLESK_MAILNAMES_D /new/MailDir

According to Plesk's business logic, it is not possible to use capital letters in the PLESK_MAILNAMES_D.

Resolution

1. Connect to the server via SSH.

2. Rename the folder used as a new mailbox location using only lower case letters via the command below:

   # mv /new/MailDir /new/maildir

   Note: In case a new path is on a mounted device, re-mount it once again using only lower-case letters in the name.

3. Re-apply the steps from the article once again using the new maildir path (/new/maildir instead of /new/MailDir). Make sure to use only lower case letters in paths.