Been using Opera.
I really like having the browser and eMail in one place.
Now Opera newsgroup seems to be disconnected.
Opera has some problems.
Try to indent by putting a few spaces in front of a line of test.
Opera removes them upon sending.
Span deletion does not work. It deletes permanently only in the
Opera window. When I restart, all the spam shows up again.

I tried Thunderbird and it is very slow.
Thunderbird programmers do not seem to know how to code to release for
user actions. It locks itself up until it finishes what it wants to
do.
Not good programming. I cannot seem to stop what is happening or do
other simple tasks until TBird finishes.

Seamonkey keeps forgetting my passwords.
It says use Password Manager to remember. What does Password Manager
belong to (part of Seamonkey or what???)? Should I not fix the
Seamonkey eMail account Settings?
I cannot find the password input place in Settings. Other eMailers
have it there. What am I missing?

What is the difference between Seamonkey and Thunderbird?

So what free eMail apps are any good?
Would be nice if it had newsgroups too but that is not mandatory.