gnus: Incorporating Old Mail

 
 6.4.8 Incorporating Old Mail
 ----------------------------
 
 Most people have lots of old mail stored in various file formats.  If
 you have set up Gnus to read mail using one of the spiffy Gnus mail back
 ends, you’ll probably wish to have that old mail incorporated into your
 mail groups.
 
    Doing so can be quite easy.
 
    To take an example: You’re reading mail using ‘nnml’ (SeeMail
 Spool), and have set ‘nnmail-split-methods’ to a satisfactory value
 (SeeSplitting Mail).  You have an old Unix mbox file filled with
 important, but old, mail.  You want to move it into your ‘nnml’ groups.
 
    Here’s how:
 
   1. Go to the group buffer.
 
   2. Type ‘G f’ and give the file name to the mbox file when prompted to
      create an ‘nndoc’ group from the mbox file (SeeForeign
      Groups).
 
   3. Type ‘SPACE’ to enter the newly created group.
 
   4. Type ‘M P b’ to process-mark all articles in this group’s buffer
      (SeeSetting Process Marks).
 
   5. Type ‘B r’ to respool all the process-marked articles, and answer
      ‘nnml’ when prompted (SeeMail Group Commands).
 
    All the mail messages in the mbox file will now also be spread out
 over all your ‘nnml’ groups.  Try entering them and check whether things
 have gone without a glitch.  If things look ok, you may consider
 deleting the mbox file, but I wouldn’t do that unless I was absolutely
 sure that all the mail has ended up where it should be.
 
    Respooling is also a handy thing to do if you’re switching from one
 mail back end to another.  Just respool all the mail in the old mail
 groups using the new mail back end.