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Had email rejected from a verizon mail server:
2014-01-07T13:22:03.751839-05:00 linux01 postfix/smtpd[15742]: connect from unknown[206.46.173.5]
2014-01-07T13:22:03.861794-05:00 linux01 postfix/smtpd[15742]: NOQUEUE: reject: RCPT from unknown[206.46.173.5]: 554 5.7.1 <vms173005pub.verizon.net>: Helo command rejected: Go away, bad guy; from=<xxxxxxxx@verizon.net> to=<blah@blah.com> proto=ESMTP helo=<vms173005pub.verizon.net>
2014-01-07T13:22:03.934627-05:00 linux01 postfix/smtpd[15742]: disconnect from unknown[206.46.173.5]
I believe it was rejected because of this line in /etc/postfix/helo_access.pcre
/^[0-9.]+$/ REJECT Go away, bad guy (not RFC compliant).
because the sending mailserver had numbers in it's name: helo=<vms173005pub.verizon.net>
i've changed this line in helo_access.pcre to one that should only catch actual IP addresses in teh helo
/\b((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.|$)){4}\b/ REJECT Go away, bad guy (not RFC compliant).
thoughts?