You have new mail.

Sometimes you forget to give that cron task somewhere to output its results... so it dumps them in your mail box... 📬😣 all 30,000 times it failed to run.

You don't have to delete all those emails one by one 😉

echo 'd *' | mail -N

d * means delete all mail. The -N means:

-N      Inhibit the initial display of message headers
        when reading mail or editing a mail folder.

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