There are two UNIX mailbox formats. Which one thats used depends on your
sendmail version/configuration.

Format 1. "^From " based.

>From Whoever@somewhere date
mail data. Any line beginning with "From " is escaped to ">From ".

Format 2, mime based

>From Whoever@somewhere date
Some mail headers
Content-Length: message length in bytes
more mail headers
[blank line]
first line of message
>From is not escaped.
message may contain any binary data up to Content-Length bytes.

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Henrik Nordström


James wrote: 
> are the mail spools in /var/spool/mail stored in a set format?

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