Hi, i wrote: > > I don't have the mail by Andrei POPESCU in my mailbox,
The Wanderer wrote: > I do. It has: > >>> In-Reply-To: <87h8664rvb.fsf@lenovo> Well, it is not about the In-Reply-To: header itself. Most of our mails here have one, with just a message id string in <>-brackets. But something seems to lure Rodolfo Medina's mail client into writing an unusual text after that id string: In-Reply-To: <20190826190505.zldub4tzker6am7d@localhost> (Andrei POPESCU's message of "Mon, 26 Aug 2019 22:05:05 +0300") A good candidate would be some header line in Andrei's mail which tells Rodolfo's mail client to send an In-Reply-To: at all, and with that text add-on in ()-brackets. (I have yet no idea how this could look like ...) > If you want the full message, I can probably pass it along as an attachment. The full header block would be of interest. (Although i have few hope to spot any strangeness.) Andrei POPESCU could join this discussion and post a test mail to which Rodolfo Medina could try to reply. This would help to understand whether it is in some way a systematic problem between the two mail clients. Have a nice day :) Thomas