Notification emails sometimes missing line breaks

[pjkcards]

I have an odd problem I haven't been able to solve, or troubleshoot.

Notification emails, like new PM, or daily digest to a subscribed thread sometimes format perfectly fine, and other times randomly show up with no line breaks. This started a few months ago, but can't pinpoint what is causing it.

The Diagnostic returns the line breaks fine, but some of the time notifications don't have line breaks, and sometimes they do. See the example below:

the thread is [removed]

the email look like the one in the attachment

It is hard to figure out since sometimes it works, and sometimes it doesn't. How can I troubleshoot this? I was going to disable mods, but not sure how I can test if it is works.

Any ideas on what I can do to resolve this?

Thanks.