Greg,
What makes me think that Nabble has something to do with it is that messages sent from other mailing clients look normal.
Wrapping is not applied to the first message, but it is for the ones that follow it. I guess, that they were sent from Nabble, which made them 80-character-wide.
I exported a few emails in a raw format from my email client. The ones, that I sent using an external client have Content-Type: text/plain
The ones, that were sent from Nabble have Content-Type: multipart/alternative
I started a thread on the Apache Ignite developers list to find the administrator, but he doesn’t want to reveal himself yet.
In the meantime I’d like to find a confirmation, that something like that can be caused by Nabble.
Is there a way to make emails be wrapped before sending?
I’ll just ask the admin to disable this feature, when we find one.