[exim] Message sizes are wrong

I see this in my (not Exim) SMTP server logs.

A friend's Exim system says it's going to send me a 7124 byte message,
but the message it sends using BDAT is actually 6001 bytes. I got the
message, it's fine, the 6001 bytes is right. This seems fairly
consistent among Exim systems that send me mail. The 6489 in the next line
includes the Received and Authentication-Results headers added locally.

It's hardly a crisis, but it seems strange.

R's,
John



2021-04-09 07:44:55.348285500 mailfront[57623]: HELO x.x.net
2021-04-09 07:44:55.403838500 mailfront[57623]: MAIL FROM:<dave@???> SIZE=7124
2021-04-09 07:44:55.645717500 mailfront[57623]: RCPT TO:<johnl@???>
2021-04-09 07:44:55.648413500 mailfront[57623]: 2.3.0 Got 6001 octets.
2021-04-09 07:44:56.890727500 mailfront[57623]: 2.6.0 Accepted message qp 57627 bytes 6489
2021-04-09 07:44:56.916122500 mailfront[57623]: bytes in: 6116 bytes out: 345
2021-04-09 07:44:56.917293500 tcpserver: end 57623 status 0