Carlos E. R. wrote:
cer@Isengard:~> telnet gmail-smtp-in.l.google.com 25 Trying 64.233.166.27... Connected to gmail-smtp-in.l.google.com. Escape character is '^]'. 220 mx.google.com ESMTP n81-v6si8524156wma.25 - gsmtp MAIL FROM: robin.listas@telefonica.net 503 5.5.1 EHLO/HELO first. n81-v6si8524156wma.25 - gsmtp RCPT TO: pjessen55@gmail.com 503 5.5.1 EHLO/HELO first. n81-v6si8524156wma.25 - gsmtp DATA 503 5.5.1 EHLO/HELO first. n81-v6si8524156wma.25 - gsmtp subject: hello test 502 5.5.1 Unrecognized command. n81-v6si8524156wma.25 - gsmtp quit 221 2.0.0 closing connection n81-v6si8524156wma.25 - gsmtp Connection closed by foreign host. cer@Isengard:~>
I'm missing some command. A EHLO, but I don't have a domain. Well, I do, but...
For the EHLO, you can use a dummy - carlos.example.com should do fine.
Or maybe it knows that Per and my domains are run by fine upstanding people who don't send spam? :) So trusts us to send plaintext.
Or that you have a properly defined domain with reverse dns.
Yes, this is a possible factor, but not a reason to bounce. For inbound traffic, we also look at the DNS config, and ask servers with poor configs to try again later (greylisting). Unfortunately, there are more mail servers than there are good admins, so refusing a mail delivery due to poor DNS config is most often wrong. -- Per Jessen, Zürich (18.8°C) http://www.dns24.ch/ - your free DNS host, made in Switzerland. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org