Форум поддержки Thunderbird

Wanted to sign in to forum.k9mail.app so I could stop asking K-9 Mail questions here. Filled out the "application," but have never received confirmation email back from forum.k9mail.app to allow me to sign in. Re-requested confirmation email 3 times; no reply. Can someone help me?

What address do I need to add to my address book so that replies from this forum don't go right into SPAM/JUNK folders?

I have thunderbird 115.11.0 (64-bit) on Linux After hitting the test button, I get this error message:

Component returned failure codeL 0x80004005 (NS_ERROR_FAILURE) [nsIFile.createUnique]

Password OK

What does this mean? How do I fix it?

GilliganFF