Hi Maurice,

On 2021-04-13 13:52:13, you wrote to me:

 MK> For the record we repeated the test on a local echoarea that all
 MK> concerned have access to and it 'failed' again which is exactly what
 MK> was suspected. Therefore we all concluded that dupe checking is ONLY
 MK> based on MSGIDs given all were original and compliant MSGs.

 MK> If you want I could repeat the third test here just to see how far your
 MK> dupe checking goes when encountering a duped MSGID.  I think it was
 MK> worthwhile.  Also the EuroPoint uses the 32-bit hex unixtime for it's
 MK> serial numbers instead of the random 8 character [:alnum:] regex one but
 MK> that shouldn't matter.  What will matter is your dupe checker's abilities
 MK> to differentiate between a real dupe and one where only the MSGID is duped.

Well FMail's dupe checking works a little bit different. When there is a valid MSGID, it also uses the first letters of the From, To and Subject, for it's dupe checking. So if they differ, while the MSGID is the same it's not considered a dupe.

 MK> Let me know and I'll make it so.

You are welcome to test it, but I already know how it works. ;)

Bye, Wilfred.

--- FMail-lnx64 2.1.0.18-B20170815