On 23 Jul 2018, at 16:17 (-0400), dur...@mgtsciences.com wrote:
Jul 23 13:53:32 postfix/smtpd[16279]: NOQUEUE: reject: RCPT from
unknown[65.100.117.244]: 450 4.7.1 Client host rejected: cannot find
your
reverse hostname, [65.100.117.244]; from=<useren...@slfcu.org>
[...]
smtpd_client_restrictions = reject_unknown_reverse_client_hostname
Read the error message carefully. This is NOT an issue with the HELO
name.
Postfix is failing to resolve 65.100.117.244 to a name. That may be
transient or it may be a configuration issue, such as attempting to run
smtpd inside a chroot jail that lacks the needed devices, an overly
restrictive packet filter (or external firewall,) or an extra security
layer (SELinux, AppArmor, etc.) that prevents DNS resolution.
Resolution is fine from here:
$ dig +nocmd +nocomments +nostats +noquestion -x 65.100.117.244
244.117.100.65.in-addr.arpa. 86266 IN PTR mail.slfcu.org.
That name even resolves back properly to the IP:
$ dig +nocmd +nocomments +nostats +noquestion mail.slfcu.org
mail.slfcu.org. 6149 IN A 65.100.117.244
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Currently Seeking Steadier Work: https://linkedin.com/in/billcole
