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