Bug#819060: proxsmtp does not handle lines with leading dots correctly

["Christoph Pleger" <Christoph.Pleger@cs.tu-dortmund.de>]

Package: proxsmtp
Version: 1.10-2.1

Dear maintainers,

(E)SMTP RFCs say that when a client is sending mail data, it must prepend
an additional dot to lines with a leading dot, and that the server must
remove that additional dot. proxsmtp does not handle that correctly; when
receiving mails, there is no special handling of lines starting with a
dot; when sending mails, the only special handling of lines with a leading
dot is to add a space at the end of the line if the line contains only one
dot.

The same problem exists in package clamsmtp (it has pretty much of the
same code), so I will report a bug for that package, too.

Regards
  Christoph