Some email not coming through w/ Greylisting

[Steve VH]

I am a web designer and I provide hosting for a few dozen clients.

I am new to Greylisting in WHM.

I noticed yesterday an email is stuck in Greylisting for 17 hours. I checked in mail reports and see this:

[I]Deferred due to greylisting. Host: '173.226.xxx.xx' From: '[email protected]' To: '[email address]' SPF: 'unchecked'[/I]

I've read somewhere that some senders use multiple IPs, making a problem for Greylisting, and I wonder if this is such a case.

Or maybe that address US Govt / Medicare doesn't resend?

I know I can add that IP to Trusted Hosts, but I am wondering why it's not coming through.

I have an initial delay of 5 min and then 240 min Resend Acceptance Period and then a 30-day Record Expiration Time.

I'd appreciate anyone's helpful input!

 

[cPanelMichael]

Hello,

You can search /var/log/exim_mainlog to see if the sender attempted to resend the message with a command such as:

exigrep [email protected] /var/log/exim_mainlog

More information on Greylisting is documented at:

Greylisting - Documentation - cPanel Documentation

Thank you.