If Claws-mail is set in tools/options/internet/email, it used to work for sending emails, at least in Ubuntu 18.04. Now in Ubuntu 22.04 it doesn't work if set explicitly (runs only if Email is empty, but that's another bug of not having attachment). Message is "LO unable to find a working mail configuration". Claws-mail is version 4.0. Tested with Lo 7.3.2.
Also in Ubuntu 22.04.01 with LO 7.3.5. But not with AppImage 7.5+, it's OK.
*** Bug 151032 has been marked as a duplicate of this bug. ***
New by duplicate.
I remove bibisectRequest as it wasn't shown that this is a regression in LO, so far it seems Ubuntu.