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port 25 経由だけか
{{{
gmail.com. 2281 IN MX 10 alt1.gmail-smtp-in.l.google.com.
gmail.com. 2281 IN MX 5 gmail-smtp-in.l.google.com.
gmail.com. 2281 IN MX 30 alt3.gmail-smtp-in.l.google.com.
gmail.com. 2281 IN MX 20 alt2.gmail-smtp-in.l.google.com.
gmail.com. 2281 IN MX 40 alt4.gmail-smtp-in.l.google.com.
gmail-smtp-in.l.google.com. 300 IN A 74.125.23.26
alt1.gmail-smtp-in.l.google.com. 300 IN A 142.250.141.26
}}}
26.97.177.108.in-addr.arpa. 14400 IN PTR tm-in-f26.1e100.net.
{{{
$ telnet gmail-smtp-in.l.google.com 25
Trying 74.125.23.27...
Connected to gmail-smtp-in.l.google.com.
Escape character is '^]'.
220 mx.google.com ESMTP r12-20020a6560cc000000b005c6cc61e9bcsi4405301pgv.359 - gsmtp
helo wk.qmail.jp
250 mx.google.com at your service
stat^Hrttls
502-5.5.1 Unrecognized command. For more information, go to
502 5.5.1 https://support.google.com/a/answer/3221692 r12-20020a6560cc000000b005c6cc61e9bcsi4405301pgv.359 - gsmtp
starttls
220 2.0.0 Ready to start TLS
Connection closed by foreign host.
}}}
== whois ==
{{{
$ telnet 108.177.97.26 25
Trying 108.177.97.26...
Connected to 108.177.97.26.
Escape character is '^]'.
220 mx.google.com ESMTP d11-20020aa78e4b000000b006d08892e9fbsi355128pfr.123 - gsmtp
starttls
503-5.5.1 EHLO/HELO first. A mail transaction protocol command was issued out of
503-5.5.1 sequence. For more information, go to
503 5.5.1 https://support.google.com/mail/?p=helo d11-20020aa78e4b000000b006d08892e9fbsi355128pfr.123 - gsmtp
helo wk.qmail.jp
250 mx.google.com at your service
starttls
220 2.0.0 Ready to start TLS
}}}
== history ==
{{{
$ openssl s_client -connect smtp.gmail.com:587 -starttls smtp
CONNECTED(00000003)
}}}
{{{
$ openssl s_client -connect gmail-smtp-in.l.google.com:587 -starttls smtp
xxx
}}}
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