Revert...

Revert "http://code.google.com/p/k9mail/issues/detail?id=3408&sort=-id&colspec=ID%20Product%20Type%20Status%20Priority%20Milestone%20Owner%20Summary"

This reverts commit 0c2e0613.

The patch would cause an extra SMTP connection on _any_ meesage with
attachments. Marcus is headed away on holiday and asked me to revert it
for him (after I asked him to revert it) - With luck, we'll talk through
a design to work around this issue on the list

Conflicts:

	src/com/fsck/k9/mail/transport/SmtpTransport.java