Unluckily there's another problem: with IMAP, I recently moved to from POP3, I can't open any message in Conversation view: the Open in Conversation [Ctrl+Shift+O] is always greyed, here, while in my other pop3 accounts this is not a rule. Actually, in my other pop3 accounts every message is viewable as part of Conversation (Open in Conversation is active): a one-message Conversation, at least, when the message is in fact alone, or its Headers are not properly filled.
When I moved to IMAP, I archived the previous POP3 folder, as safeguard in case of issues with my first use of IMAP. Starting IMAP, I stopped receive e-mails as POP3, of course, disabling the pop3 server. But with such archiving I now have available, from the past months, several (apparently) identical messages originally received with POP3, and then copied to IMAP folders: this could be useful for a comparison of the Headers. A I said, for the ones stored in the old POP3 (backup) folder, it's possible to open them as a Conversation; not so for the IMAP. Maybe a difference in the Headers.
Please could you control if you notice any remarkable differences in the two Headers?
I can't understand why I can/can't open the same message as Conversation. The only explanation I suppose is a difference in the two Headers, occurred when moving to IMAP.
The e-mail comes from a newsletter: a one-off message.
POP3:
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