E-Mail address obfuscation non-functional on subject

[Alster]

Hi!

I realized that the email address obfuscation a la "me
at mydomain.com" (at-sign replaced by " at ") instead
of "<email address hidden>" (plain at-sign) does not take
place if the email address is given in the subject line
of an email.

Especially spam and email address verification emails
put email addresses into the subject line. While this
is a bad habit, it still happens and simplifies
(re-)harvesting of email addresses from pipermails'
archives.

Thanks,

Alster

[http://sourceforge.net/tracker/index.php?func=detail&aid=1059633&group_id=103&atid=100103]