Message-ID: <3F5DE8E3.1060602@netzero.net>
Date: Tue, 09 Sep 2003 10:51:15 -0400
From: Finn Lassen <finnlassen@netzero.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: File size
References: <list-2573124@logan.com>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit

When you are transmitting a binary file, like a picture, the actual size 
of the transmission increases.
Why? Because the binary data is being transmitted in visible characters, 
sort of 6 bit "bytes". In other words 8 bit bytes are expanded into 6 
bit "bytes".   So the size increases by at least 8/6 = 33%.
On top of that you have all the mail headers.

View the "Message Source" of a received message containing pictures 
sometime and note the
"Content-Transfer-Encoding: base64" tag preceeding the block of 6-bit 
ASCII characters representing the picture. 6 bits gives you 64 possible 
characters.

Finn

> "Al Gietzen" <ALVentures@cox.net>:
>
> Marv;
>
> How does your e-mail system add-up bytes?  I sent a posting that had 3
> attached files totaling 82KB.  The letter itself was 224 bytes.  It was
> rejected as beign over 100KB.
>
>  
>
> Maybe it's time to increase the limit?
>
>  
>
> Al
>