Error: Certificate does not contain an email address
@ChristophWurst is already working on this.
Since May 20, 2026.
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Description
Steps to reproduce
Hi so after the recent update to Mail I now can't get into the mail app in my Nextcloud instance. I already tried re-installing it but no dice.
What happens is I get a Nextcloud page the only says....
Internal Server Error
The server was unable to complete your request.If this happens again, please send the technical details below to the server administrator.
More details can be found in the server log.
For more details see the documentation ↗.
Technical details
Remote Address: REDACTED
Request ID: A71Qnm3jp3Fv3JvuSle0
Checking in the logs I get about 15 entries of the same error log for index saying...
[index] Error: Certificate does not contain an email address
GET /apps/mail/
from REDACTED by USER at 20 May 2026, 15:39:17
Anyone got any ideas?
Expected behavior
Mail app loads
Actual behavior
Page loads that says...
Internal Server Error
The server was unable to complete your request.If this happens again, please send the technical details below to the server administrator.
More details can be found in the server log.
For more details see the documentation ↗.
Technical details
Remote Address: REDACTED
Request ID: A71Qnm3jp3Fv3JvuSle0
Mail app version
5.8.0
Nextcloud version
33.0.3
Mailserver or service
Local Mailserver using SMTP and IMAP
Operating system
No response
PHP engine version
None
Nextcloud memory caching
No response
Web server
None
Database
None
Additional info
No response
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