Can someone advice on how the best way to detect a circular mail?

I have smtp server and the mailboxes are all GSM. Sms are sent to
another smtp server who deliver it for email reader (pop3 or imap). When
users send email the other smtp server delivers it to mine who send it
then to the GSM's.

But there could be circumstances (wrong settings by IT manager) that I
deliver a mail the the other server who send it back and so on. The way
around is also possible. For example by filling in a wrong domain or an
IT manager email at wrong domain or so.

Rgds, Wilfried

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