My client is not getting mail of having it delayed for up to a day which makes it hard to run their business. I have been trying to trouble shoot but cannot use tracked deliver in cPanel as it seems you have not configured the exim settings correctly. I have used external systems to set the sending of mail to the general info account and had failed like below. Every once in a while it will not disconnect or time out and a mail will go through straight away with not pattern or reason.
Please suggest a course of action.
Checked and validated MX records.
Validated it is local mail exchanger.
Happens for mail sent from a multitude of other providers to the accounts under our domain in cPanel (gmail, outlook, exchange, etc)
Sample error trying to send a mail:
mail.issaquahdance.com. - 220.127.116.11 [Could not connect: Could not receive data: Operation timed out.]
Using: https://ismyemailworking.com/AdvancedTest/ with email@example.com I had it work once end to end. It shows the MX lookup is working as it tries to talk to the server but gets a disconnect
error from gmail with personal email addresses removed.
From: Mail Delivery Subsystem <firstname.lastname@example.org>
Date: March 18, 2019 at 11:55:29 AM PDT
Subject: Delivery Status Notification (Delay)
There was a temporary problem delivering your message to email@example.com. Gmail will retry for 45 more hours. You'll be notified if the delivery fails permanently.
The response was:
The recipient server did not accept our requests to connect. Learn more at https://support.google.com/mail/answer/7720[mail.issaquahdance.com. 18.104.22.168: unable to read banner]