Sorry, my point was that you could not just assume the sending host
was a mail server by connecting back to the host on the submission
port as it might not be listening on that port or that because the
host sending is not in the MX list, that its not a mail server.
On 9/14/05, Mike Tancsa <email@example.com> wrote:
> >Port 587?
> Not everyone implements that. You would make a large part of the
> internet unreachable via email
> vinyl# telnet mx2.mail.yahoo.com 587
> Trying 22.214.171.124...
> telnet: connect to address 126.96.36.199: Connection refused
> Trying 188.8.131.52...
Wrong host. 587 / msa is for outbound email