julianop
Wait for new mail to come in (from this eu domain address) & without having first opened mail in Thunderbird, you should review mail using webmail (that is built in to SME server)
https://yourSMEserverdomain/webmail
Good thinking, Janet; I should have thought of that myself. I'll do exactly that. I have used the webmail client, and in fact do so once a month for its helpful sent-folder archiving.
Unless you have previously configured webmail, it should not be doing anything to move or filter messages & I assume you should see your messages from the eu domain address.
This is just to prove whether SME server is in anyway involved (it appears not to be so far).
If you can see the messages, then the problem is more likely to be with your Thunderbird mail client settings.
Got it. No, I haven't made any configuration changes to webmail, so this should indeed be a definitive test. Kind of a "duh!" moment for me, thanks, and I'm embarrassed for being so dim!
You did not answer yet if you totally disabled spam filtering in Thunderbird (as an experiment at least to see what effect it is having).
Oops, apologies. I did not do so, but will do so, in order of your suggestions: it seems that the webmail test would be the first, obvious (!) test.
Re trying another profile, that may not be too useful as I think the Thunderbird default is for spam filtering to be on.
I did so on the suggestion of another helper. I don't remember myself now, either !
Have you looked deeply at Thunderbird settings for each email account you have set up ?
I have looked at the UI level, I haven't delved into the config file itself. I'll try your other suggestions first, then tie a rope around my waist and to a nearly tree and go spelunking if I need to after that
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Thank you for your thoughtful and helpful response.