Conditional Messages

Is there any way to do conditional code depending on first letter of email address?

If TAG "begins with a-l" do X
ELSE do Y

i.e. if email address begins with any letter a-l do X else do Y

I though you could do it with 13 #? tests, i.e. check first letter of email tag, but I can't seem to get them to work at all . Am I going on the right lines?
 
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