[Bug] E-mail reports are not displayed correctly

[lourdas]

What happened?

I've configured automated email reports for my Matomo installation for two sites. The e-mails are sent, but they are not displayed in Thunderbird:

The email message size is not zero, the size for the e-mail at the above screenshot is 952KB.

The HTML message source code is something like this:

The same result is when I send the e-mail reports manually from the administration interface.

I've also stumbled upon this PHP bug. Could this be somehow related?

My vps is a Linux server, with PHP 8.1.29 FPM and Apache 2.4.62.

What should happen?

The email reports should look fine in Thunderbird, like this:

This is from another Matomo installation with PHP 8.1.29 too that I manage.

How can this be reproduced?

Can't really tell, since I don't know if this is PHP related or something else. This is an old installation from many years ago, but email reports used to work fine.

Matomo version

5.1.1

PHP version

8.1.29

Server operating system

Linux

What browsers are you seeing the problem on?

Not applicable (e.g. an API call etc.)

Computer operating system

Linux

Relevant log output

No response

Validations

• [X] Read our Contributing Guidelines.
• [X] Follow our Security Policy.
• [X] Check that there isn't already an issue that reports the same bug to avoid creating duplicates.
• [X] The provided steps to reproduce is a minimal reproducible of the Bug.

[des-innocraft]

@lourdas thank you for raising this ticket. Can I ask if you still encounter the same issue on Thunderbird?

I tried replicating but got no luck:

If yes, can I ask what is the Thunderbird version you used? Also do you experience the same on other email apps?

[lourdas]

Hi @des-innocraft

This is Thunderbird 115.14.0. I administer another Matomo installation which is hosted in a different server and the e-mail reports are sent and displayed fine in the same Thunderbird installation:

So, I guess something must be configured incorrectly in the server.

Help is needed to debug this issue. What information do you need in this direction?

[des-innocraft]

@lourdas thank you for the reply. I assumed this only happens in one of your server. This might be a server configuration issue. Does this server has the same server configuration with the new installation on another server(where email works as expected)?

Can you export the email where the error happens ans we'll see if we can reproduce? Also, this error only happens on Thunderbird and not other mail app or webclient?

[lourdas]

@des-innocraft This is a screenshot of my web mail displayin the report:

Which is actually the source code of the message in Thunderbird:

(I'm showing the source code, since Thunderbird cannot decode the message properly and actually displays a blank page, see my initial message).

You write about exporting the email. What exactly do you mean?

[des-innocraft]

@lourdas thank you for your reply. What I meant for exporting the email is saving the email file and attached it here so we can try check and try to reproduce. Currently we are not able to reproduced and not aware of any existing issue like this. This maybe a rare case happening only on your instance.

Have you tried other mail client like Outlook to see if the emails are like this as well?

[lourdas]

I've attached the problematic report.

No, I haven't tried other mail clients besides Thunderbird and my webmail, but I highly doubt the client is the issue here. My Thunderbird installation works perfectly. The e-mails generated from this specific installation are the issue. report.zip