HTML Email discarded without notification, where to look?

[dzeri]

Hi,

I have a problem with emails with HTML content, sent to one of our client.
These emails do not arrive to target email, don't come back to the sender with some notification, and they're not present in cPanel email track delivery page, but they're always succesfully sent.

The emails sent has several links pointing to www.domain.it, if I modify that mails (sending as new one) changing that url to i.e. www.example.it, then the mail got received.

Where can I look to let these emails reach the target?

 

[cPanelLauren]

I'd first check in the exim logs at /var/log/exim_mainlog all email transactions would be listed here.

 

[dzeri]

Hi Lauren,


thanks for the reply and excuse me for the external urls.


Today the email has been delivered to the target and we have did nothing...


The logs, when the email failed to reach the target, are:
2019-10-28 10:44:39.702 [1524] SMTP connection from [IP]:23317 I=[IP_TARGET]:25 (TCP/IP connection count = 2)
2019-10-28 10:44:39.765 [115408] H=SENDER [IP]:23317 I=[IP_TARGET]:25 Warning: Sender rate 1.0 / 1h
2019-10-28 10:44:40.253 [115408] SMTP connection from SENDER [IP]:23317 I=[IP_TARGET]:25 lost while reading message data (header)

 

[cPanelLauren]

That error message doesn't show anything to do with the message except that a connection over port 25 was lost. What is the output if you do the following:

grep [email protected] /var/log/exim_mainlog

That should display the message ID and from there run the following to get the full transaction:

exigrep messageID /var/log/exim_mainlog

 

[dzeri]

We can't do that check, because we only have these 3 lines of log regarding the lost emails, after that, there is no more data about the lost email.

 

[cPanelLauren]

You noted the following:

Today the email has been delivered to the target and we have did nothing...

What is the change in the logs between the two?