[imp] Incorrect handling of '.' character in IMP 2.3

[Paul Juliano]

>Hello,
>
>I spotted a bug with IMP 2.3.7-cvs - If you compose a message and 
>include a line containing a single '.' e.g.
>
>.
>

I'm getting the same result.  The single '.' and anything below doesn't get
sent.  Using php-4.0.5-cvs (old), imp-2.3.7-cvs (old), and I'm sending mail through SMTP, not sendmail.

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