AndCycle writes:

Gentoo Linux dist.
Linux bacztwo 4.9.6-gentoo-r1 #2 SMP Wed Feb 8 04:09:10 CST 2017 x86_64
Intel(R) Xeon(R) CPU E3-1231 v3 @ 3.40GHz GenuineIntel GNU/Linux
mail-mta/courier-0.76.4

I recently upgrade by linux kernel to 4.9.2, which result in courier
spit out following error message

Feb  8 05:10:24 bacztwo courieresmtpd[8789]: started,ip=[190.173.150.46]
Feb  8 05:10:25 bacztwo courieresmtpd[18270]: gdbm fatal: couldn't init
cache
Feb  8 05:10:25 bacztwo courieresmtpd[8789]: submitclient: EOF from submit.
Feb  8 05:10:25 bacztwo courieresmtpd[8789]:
error,relay=190.173.150.46,msg="502 ESMTP command error",cmd: DATA

as it complain gdbm fatal error, courier won't accept any smtp mail,
in the end I have to put an boot option "ignore_rlimit_data" to solve
this issue,

is there other proper way to fix this issue?

No issues with kernel 4.9.6 in Fedora.

What is ULIMIT set to, in your esmtpd configuration file? The default setting is 16384. Increase it.

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