Ron Wheeler:
> I am also the family genealogist and just moved to Gramps from FTM.
> 
> I am not sure what "multiple from addresses" actually means. It is not 
> possible for an email to come from more than one email address at a time 
> in reality.

Multiple addresses in one From: header are allowed by the RFC 5322 spec.
Multiple From: headers in a message are not OK.

Syntax from https://tools.ietf.org/html/rfc5322#section-3.6.2

   from            =   "From:" mailbox-list CRLF
   sender          =   "Sender:" mailbox CRLF
   reply-to        =   "Reply-To:" address-list CRL

https://tools.ietf.org/html/rfc5322#section-3.4 defines
of mailbox-list, mailbox, and address-list.

And a table in  https://tools.ietf.org/html/rfc5322#section-3.6
defines the minimum and maximum number of times that a message
header field is allowed in an email message.

        Wietse

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