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Outbound Emails Failing Due to Blank “From” Header in WHM Server

Xavier
  • Edited

Hi everyone,
I’m facing an issue where my WHM server is unable to send outgoing emails. All mails sent from the server are getting rejected by Gmail and some other providers due to a missing “From” header.
Below is an example of the bounce message:
This message was created automatically by mail delivery software.

A message that you sent could not be delivered. This is a permanent error.

The following address(es) failed:

 --------

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  myemail@gmail.com
    host gmail-smtp-in.l.google.com [123.45.67.8]
    SMTP error from remote mail server after end of data:
    550-5.7.1 [123.45.67.8] Messages missing a valid address in From:
    header, or
    550-5.7.1 having no From: header, are not accepted. For more information, go to
    550-5.7.1  https://support.google.com/mail/?p=RfcMessageNonCompliant and review
    550 5.7.1 RFC 5322 specifications. 2f3a-b734fc3b912si189586866b.509 - gsmtp

 

---------- Forwarded message ----------
From: 
To: <myemail@gmail.com>
Cc: 
Bcc: 
Date: Fri, 14 Nov 2025 04:39:11 GMT
Subject: [server.example.com] New account: dummyuser (dummyuser.shop)

 

As you can see, the “From” field is completely empty, and because of this Gmail rejects the message.
Server details (all dummy):


Hostname: server.example.com

cPanel/WHM Version: 130.0.16

Exim version: 4.98.2


I’ve checked the Exim configuration, but I can’t figure out why system-generated messages are missing the “From” header. This issue affects Security Advisor alerts, cron emails, and other automated notifications.
If anyone has faced this or knows how to fix the missing From header in WHM/Exim, please guide me.
Thanks in advance!

Comments

5 comments

Date Votes
  • Xavier

    cPRex ?

    0
  • cPRex Jurassic Moderator

    Hey there!  We only reply to forums post during weekdays so I wouldn't have seen this over the weekend.

    I haven't had this complaint from any other users, and my personal notifications definitely include the"from" field for the automated server messages.  Does the same problem also happen with a normal email sent from a user's email account in Roundcube?

    Have you made any customizations to Exim on this machine that could explain this?  In the WHM >> Exim Configuration Manager page there is a "reset" option if you'd like to try that just to see if that changes the behavior in any way.

    0
  • alanstar

    I'm currently on 130.0.15 and looking to apply the 130.0.16 update. However, this post got my attention as we use Exim to send emails and have made several customisations to the configuration. Currently our mail works flawlessly but this makes me nervous. Can you confirm if the update includes any Exim related changes? I understand that you're not aware of any other users having problems but it would be good to have some reassurance about the scope of this update.

    0
  • cPRex Jurassic Moderator

    alanstar - you can always check the changelog for each version here:

    https://docs.cpanel.net/changelogs/130-change-log/

    There is nothing related to email in 130.0.16

    1
  • alanstar

    Thank you for the reassurance, I proceeded with the update and have not seen any issues.

    1

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