a1055821319@gmail.com
Subject: TCP connection timeout from sonic306-1.consmr.mail.bf2.yahoo.com to our MX
When sending email from [@yahoo.com] to [@khc.com], Yahoo mailer-daemon reports "Unable to deliver message after multiple retries, giving up."
Sending MTA: sonic306-1.consmr.mail.bf2.yahoo.com (74.6.132.40).
Gmail can deliver emails to our MX normally. Our MX port 25 is open from US network, our MX IP is not in any blacklist.
No SMTP session was created, the issue is TCP handshake timeout only from this Yahoo sonic cluster.
Please check the routing from 74.6.132.40 to our MX IP [113.108.187.182].
Attachments: bounce email header, MXToolbox test result.
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