Let's Encrypt has a limit of 100 Names per Certificate this means that a mail server at mail.example.org with autoconfig.example.org and autodiscover.example.org could only have a maximum of 48 additional domains adding with autoconfig.* and autodiscover.* subjectAltNames.
The situation will improve some when Let's Encrypt supports wild cards in January 2018 then there could be a maximum of 100 domains per cert.
However I have a mailserver with 200+ domains that I'm in the process of migrating to Mailcow and I'd like to help to add support for Mailcow to run with multiple certs as a work around for this issue.
Let's Encrypt has a limit of 100 Names per Certificate this means that a mail server at
mail.example.orgwithautoconfig.example.organdautodiscover.example.orgcould only have a maximum of 48 additional domains adding withautoconfig.*andautodiscover.*subjectAltNames.The situation will improve some when Let's Encrypt supports wild cards in January 2018 then there could be a maximum of 100 domains per cert.
However I have a mailserver with 200+ domains that I'm in the process of migrating to Mailcow and I'd like to help to add support for Mailcow to run with multiple certs as a work around for this issue.