FidoNet NetMail can now be gated to an SMTP client (as before), but replies are
now successfully gated back to FTN NetMail. This uses a new more RFC-compliant
To/From address header field format, so older messages (previously gated to
an SMTP client) cannot be successfully replied-to. Tested with Microsoft
"Windows Live Mail 2012" (previously known as Outlook Express).
Test reports/results with other SMTP mail clients would be welcome.

Requires SBBSecho v2.30 or later. File attachments are not yet supported.