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I am new to Unix here.

We have some mailboxes that are taking up an incredible amount of space and I'm trying to figure out a way to delete all mail that has been in the box for 30 days. Most of what I look up, deals with just one mailbox.

I haven't done much in this area yet and any help would be greatly appreciated.

  • To be clear, do you want to totally remove all mail every 30 days (so even mail which arrived 2 seconds ago gets deleted), or do you want to remove items of mail over 30 days old from all mailboxes. – EightBitTony Mar 2 '16 at 14:57
  • I see my miscommunication. I would like to remove mail that has been in the system for 30 days. – N. Hanks Mar 2 '16 at 15:04
  • Next one, can you confirm how mail is stored on the server, is it mbox (traditional, everyone has a single /var/spool/mail/username file), or Maildir (where everyone has a directory, in which individual items of mail are single files). I'm assuming the former, but better to know for definite. Also, which UNIX or Linux distribution? – EightBitTony Mar 2 '16 at 15:20
  • It is the former. As far as the distribution I'm afraid when I try and proc/version it says it's denied...unsure of why. – N. Hanks Mar 2 '16 at 15:32
  • Ah well, archivemail looked useful, but new versions don't allow root to expire other users mail files, which seems a backward step. Do you have an example for one user that you know works, but you just want to use it on all the mail files? – EightBitTony Mar 2 '16 at 15:41
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If you want to clear out all of the mailbox contents except maybe root and some other protected user, you can use something like this:

for mbox in $(ls /var/spool/mail/*|grep -v -e root -e protecteduser);do >${mbox};done

and schedule it in cron to run on the 1st day of each month with

crontab -e 

insert the following line at the end of the crontab:

0 2 1 * * /path/to/mailbox/cleaner/script 

this will make the script run on the first day of each month at 2 AM

On the other hand if you need to clean mail which is older than 30 days in each mailbox, it will need a totally different approach. If this is your intention, please update your original post.

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