Apple Mail keeps crashing frequently after RAM problem
Since you had a faulty RAM, the first target of corruption is the whole filesystem. It is a good point to have eliminated this possibility of huge trouble.

If your problem does only appears within Mail this could mean that one of the files Mail had to write back was corrupted (in RAM).

To confirm this hypothesis:


make a backup
quit Mail and make a local backup of your Mail library (the following are shell commands to type within Terminal):

cd ~/Library
mv Mail Mail.backup

start Mail, create you a minimal account configuration
and send yourself an E-mail

If Mail doesn't crash, the problem stands within one of your Mail library file

If Mail still crashes, report it.
quit Mail and put back in place the library you backed up at step 2:

cd ~/Library
rm -rf Mail
mv Mail.backup Mail



If step 3 confirms that the problem stands within your Mail library,
and if your mailboxes aren't too big, you could then make a rebuild of them:


launch Mail
select

Mailbox &gt; Rebuild

be patient, don't corrupt its rebuilding task, open the activity window:

Window &gt; Activity