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Delay in sending mails to other domains

Posted: Mon May 20, 2019 6:08 am
by kjpradeep
zmcontrol - v
Release 8.8.11.GA.3737.UBUNTU16.64 UBUNTU16_64 FOSS edition, Patch 8.8.11_P4.

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.6 LTS
Release: 16.04
Codename: xenial

Our domain :

We have a small office with less than 10 users. The email volume is hardly 10 emails per day. The problem is that the outgoing email from our domain to external domains like yahoo or gmail is taking at least 45 minutes and sometimes 4 hours. We see that there are no exceptions in logs.

The only error that we suspect is is conversation with[] timed out while receiving the initial server greeting

Attaching the relevant screenshots from logs and gmail message header analyzer tool

We have fixed our domain w.r.t. SPF , DMARC , DKIM, reverse DNS

Re: Delay in sending mails to other domains

Posted: Tue May 21, 2019 7:53 am
by gabrieles
Looks like this