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[FIXED BUG] Plesk email account via Outlook IMAP/POP3 returns the following after syncing: Message appears to be a Unicode message and your E-mail reader did not enable Unicode support.

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Ekaterina Babenko
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kb: fixed kb: bug Plesk Obsidian for Linux

Applicable to:

  • Plesk Obsidian for Linux

Symptoms

  • Plesk Obsidian is used:

    # plesk -v | grep 'Product version'
    Product version: Plesk Obsidian 18.0.25.0

  • After connecting Plesk mail account to Outlook, it returns any of the following error messages after syncing:

    CONFIG_TEXT: Message 2536 appears to be a Unicode message and your E-mail reader did not enable Unicode support. Please, use an E-mail reader that supports IMAP with UTF-8(see https://tools.ietf.org/html/rfc6855.html)

    CONFIG_TEXT: This E-mail message was determined to be Unicode-formatted but your E-mail reader does not support Unicode E-mail. Please use an E-mail reader that supports POP3 with UTF-8 (see https://tools.ietf.org/html/rfc6856.html)

  • Courier-IMAP was upgraded to version 5.0.

    # rpm -qa | grep courier-imap
    psa-courier-imap-5.0.8-2.centos.7+p18.0.20.2+t191101.1317.x86_64

  • The issue may appear in other mail clients also

Cause

Courier-IMAP 5.0 implements rfc6855 and rfc6856, which result with an alert in any IMAP/POP3 client on attempt to fetch a mail message with national symbols (UTF-8) in headers. This happens because mail client does not implement properly changes made in rfc6855 and rfc6856.

The improvement for this behavior has been published :

  • #PPPM-11248 "After update to Plesk Obsidian, IMAP and POP3 mail accounts configured in Outlook now correctly show emails with UTF-8 characters."
    Fixed in:

Resolution

Please consider updating your server:

Workaround

If update is not possible for some reason you may try the following

workaround

As a workaround the following actions can be performed:

  • Switch the IMAP/POP3 server to Dovecot following the instructions from our article.
  • Use webmail;
  • Use a different mail client.

Comments

3 comments

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  • Avatar
    Brian Essig

    [user@server ~]$ sudo plesk -v | grep 'Product version'
    Product version: Plesk Obsidian 18.0.29.2

     

    Still getting emails containing:

    Your IMAP server wants to alert you to the following: Your IMAP client does
not appear to correctly implement Unicode messages, see
https://tools.ietf.org/html/rfc6855.html

    Is there anyway to disable these messages from going out?

     

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  • Avatar
    Yulia Plokhotnikova

    Hi @Brian Essig,

    It is supposed to be fixed in the version you are using, so something is missing here. We would like to look into this issue closely. Please submit a support request to Plesk directly or to a reseller, depending on where the license was purchased.

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  • Avatar
    Brian Essig

    Yulia Plokhotnikova and anyone else who faces a similar issue, I had to restart the courier-impad services:

     

    service courier-imapd restart

    service courier-imaps restart

     

    My best guess is that the panel and associated rpm's updated on the server but thier running instance was never restarted so it was still technically running the old version as the running processes.  Once I did this my problems went away.

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