Email addresses containing capital letters do not work

Created:

2016-11-16 13:19:10 UTC

Modified:

2017-04-24 11:39:31 UTC

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Email addresses containing capital letters do not work

Applicable to:

  • Plesk for Linux

Symptoms

Various issues may occur if mailbox name contain upper-case letter(s).

The non-working functions may include:

  • Delivery
  • Authorization
  • Autoresponder
  • Migration
  • Spam-filtering
  • Others

Diagnostics

Run the below command to find mailbox name that containe upper-case letters.

# ls -R /var/qmail/mailnames | grep -v Maildir | grep -v attachments | grep : | grep [A-Z]
/var/qmail/mailnames/example.com/mailName:
/var/qmail/mailnames/example.com/testNAME:

Workaround

Rename the mailbox name.

Using the Plesk Panel GUI :

Go to Home > Subscriptions > subscription_name > Mail > mailbox_name > Email Address:

  • Change mailbox name from Mail.Name@domain.tld to mail.name1@domain.tld

  • Change mail.name1@domain.tld to mail.name@domain.tld

OR using CLI :

#  /usr/local/psa/bin/mail --rename Mail.Name@domain.tld -new mail.name1
SUCCESS: Renaming mailname 'Mail.Name@domain.tld' complete

# /usr/local/psa/bin/mail --rename mail.name1@domain.tld -new mail.name
SUCCESS: Renaming mailname 'mail.name1@domain.tld' complete
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