Knowledge Base

Unable to secure MailEnable webmail on Plesk server with Let’s Encrypt certificate: Securing “mewebmail” webmail service is not supported

Symptoms

The checkbox for Secure webmail on this domain is disabled in Domains > example.com > Let’s Encrypt with the following notice:

PLESK_INFO: Securing “mewebmail” webmail service is not supported. Configure mail settings.
MailEnable Webmail is used as a Webmail for the domain in Domains > example.com > Mail Settings > Webmail.

Cause

Securing MailEnable Webmail with Let’s Encrypt was implemented in the scope of the feature request EXTLETSENC-134 which was released in Let’s Encrypt 2.12.4.

Resolution

Update the extensions Let’s Encrypt and SSL It. Also, enable the feature Common-Challenge Directory:

Connect to the server via RDP
Open the command prompt as Administrator
Enable Common-Challenge Directory:

C:> plesk ext sslit –common-challenge-dir -enable

As a workaround, perform the following steps:

Log into Plesk.
Switch webmail to Horde using the following article: How to change webmail for a subscription?
Secure the domain and webmail with a Let’s Encrypt certificate under Domains > example.com > Let’s Encrypt > Secure webmail on this domain.
Switch webmail back to MailEnable (see step 2 for instructions).

Note: webmail Contacts will be available again after this.