Re: [exim] Message sizes are wrong

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Author: John R. Levine
Date:  
To: John C Klensin
CC: Exim-users
Subject: Re: [exim] Message sizes are wrong
On Fri, 9 Apr 2021, John C Klensin wrote:
>> 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


> (1) I can't guess whether this is the source of the problem but,
> depending on how an MTA is organized, trying to avoid extensive
> look-ahead, etc., making an estimate and rounding up seems
> operationally sensible now matter what the spec says.
>
> (2) The intention with SIZE was always to specify a maximum. ...


Oh, sure. If the size were slightly higher than the real amount that
would make sense but they are often wildly different.

FWIW, Microsoft is even worse, SIZE=18944, actual size 9543, or
SIZE=18979/9547, or SIZE=70805/44046, or SIZE=24664/12416.

Some other senders like Google consistently send SIZE that exactly matches
the message size.

Regards,
John Levine, johnl@???, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly