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When Pine deals with your new mail, it copies the mail
spool file:
/mail/userid/userid
and appends it to the file:
/mail/userid/mbox
and then works on the mbox file. (This
is to prevent corruption to your real incoming mail file
while you're reading your mail and new mail comes in for
you.) For a very short time during this copy process, both
the mail spool file and the mbox file
must exist at the same time; when the copy is finished the
mail spool file is emptied (but the file remains).
Therefore, for a brief time, the disk space usage is:
(mbox file) + (mail spool file) + (copy of mail spool file)
Once this copy process is completed, you'll only be using
as much disk space as:
(mbox file) + (mail spool file)
which will all be in your mbox file.
If you don't have enough room under your quota to handle
this copy procedure, you'll get the (misleading) error
"read only" message.
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