503 5.5 2 need mail command

A classic!

The command you're looking for is mail with the following options:

mail -s "Subject" 503 5.5 2

Here's a breakdown of the options:

• -s "Subject": sets the subject of the email
• 503 5.5 2: is the recipient's email address, in the format of "error code error message recipient email address"

So, the complete command would be:

mail -s "Error notification" 503 5.5 2

This will send an email to the recipient with the subject "Error notification" and the body containing the error message.