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tracking opened emails

We are sending orders to our supplier via email.  The email is plain text, no attachments or html. Its been working well... except... sometimes the supplier claims they didn't see the email.  I call BS, and I'd like to know if the open the email.

Is there some common method for tracking if an email has been opened?  FYI we are using gmail for our email including smtp sending via gmail.

Email ClientsEmail ProtocolsInternet / Email Software

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8/22/2022 - Mon