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

[Lars Hecking]

Ray Jackson writes:
> 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.
> 
> .
> 
> Then anything below that dot is not sent in the message and we see 
> errors in our sendmail logs.  Now, of course the reason is that '.' is 
> used in SMTP to close a connection - so obviously the '.' is not being 
> escaped properly as normal mail clients do to avoid SMTP interpreting 
> the '.' in the body as a Close Connection instruction.
> 
> Is this a PHP problem or rather an IMP specific problem?

 How does 2.3.x send mail? If it uses injection via the sendmail program,
 it must be called with the -i option. If it uses smtp directly (through
 php or whatever), the smtp client must implement the transparency procedure
 outlined in RFC 2821 section 4.5.2.