Emails not being delivered no error message

[Alex H]

Hi A client is complaining that some emails are not being delivered but no error message is being sent.

I ran a check using MX Toolbox and got the following warnings:
SMTP Reverse DNS Mismatch - Reverse DNS does not contain the hostname
SMTP Banner Check Reverse - DNS does not match SMTP Banner
SMTP TLS Warning - Does not support TLS.
SMTP Transaction Time 15.169 seconds - Not good! on Transaction Time

Do I need to start playing with the EXIM configuration or are these possibly false alarms?

 

[cPanelMichael]

Hello,

The following document is a good place to start:

How to Keep your Email out of the Spam Folder - cPanel Knowledge Base - cPanel Documentation

Once you have ensured those guidelines are followed, review /var/log/exim_mainlog to see if there's any additional information about what happened to an affected message if the issue persists. EX:

exigrep [email protected] /var/log/exim_mainlog

Thank you.