I see now that "mail access" being secured doesn't include mail.domain.tld.
Just imap.domain.ltd, etc.
Seems like a strange omission, but oh well.
Installing a wildcard SSL as @scsa20 suggested resolved it in the end.
Thanks all.
Hi all,
I have Letsencrypt SSL certs installed for all of my domains (7 in total), and everything works fine from the web side of things.
Two, for example are
urizenmedia.com
jewellerymentor.com.au
For email though, all domains report the SSL as invalid.
Using...