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I have recently had a system crash, power related, and I'm in the process of getting it back together, almost there, thanks to be having a good backup which included most of my configuration files.
Good news as I forgot how I managed to configure sendmail, apache etc etc.
Anyway, I have copies of /var/spool/mail and I wish to copy all of each users mail to the current /var/spool/mail folder.
This redirect appends the output to the target file, rather than overwriting the entire contents of the file.
e.g
cat /oldmail/bob >> /var/spool/mail/bob
You can use this in a script to do the whole set of current mailboxes.
If you are going to append stuff to a full set of live mailboxes it's a good idea to schedule downtime and stop the SMTP, POP and IMAP services first so that no mail goes in or out of the boxes whilst you are running the script.
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