weird unencrypted chat with empty-bubble messages from chatmail user

[adbenitez]

some users (using latest 2.50+ core, at least some of them) report receiving this kind of chat:

it seems it is from a peer in a group they share in common, whom is the peer and what version are they using is not clear, likely not latest version, so maybe it is an incompatibility problem from old-to-new handling of messages

[adbenitez]

UPDATES:

now got confirmation from some users: some of the receivers had 2.51.0 other had 2.49.0 and another 2.46.0 so it seems the problem is not some bug introduced in the receiver side but perhaps in the sending side

it seems another person also was sending such empty messages, still didn't manage to contact any of the senders that are triggering this so can't confirm what version are they using but since this was working in the past, it seems they likely updated to 2.50+

screenshot of another sender triggering that empty messages:

[link2xt]

It is also chatmail.email in both cases. I tested creating a profile there and sending 1:1 messages, this does not result in problems, so at least it is not obviously the relay problem (i thought it might be dropping some headers or adding them).

[adbenitez]

MORE UPDATES: I was able to contact the sender, he is using 2.51.0

and I also got added to the group where this was happening: it only happens to people with nauta.cu relays, so somehow related to chatmail.email -> nauta.cu

[link2xt]

Can one of the receivers make a screenshot of the message info (developer info) with the Message-ID etc.? I wonder if the Message-ID looks like something generated by us (UUID@localhost) or not. This will make it clear if this is a misinterpreted or damaged chat message, or something generated by the server (sort of bounce message created by nauta.cu without the body). If someone can find a message in the inbox and get .eml of it that would be even better.

[adbenitez]

here is an screenshot of such messages:

[link2xt]

So it is a message generated by nauta.cu (amavis3.etecsa.net host) and is not some compatibility problem between core versions. Or maybe nauta.cu rewrote the Message-ID and broke the message somehow.

Would be interesting to know how the message looks like in webmail and in .eml, it probably has some part that is not displayed or is some sort of report.

I have only found this hostname in one place on the web (with ddg, google and startpage found nothing):
https://lists.debian.org/debian-user-spanish/2022/03/msg00076.html