Vacation allows for an autoreply email to be sent to every sender of every email received. The sender only gets one vacation autoreply message, even if multiple messages are sent. Emails coming from nefarious sources will also be sent an email.
Vacation needs to be manually activated and deactivated.
Log in to a CSEE UNIX system.
Edit ~/.vacation.msg and write your autoreply message. Full email headers need to be included in the message (full headers, blank line, and then message body). Here is an example:
From: email@example.com (John Doe) Subject: I am on vacation I am on vacation until July 22. If you have something urgent, please contact Jane Doe <firstname.lastname@example.org>. --john
Initialize your vacation database with
Edit ~/.forward and make sure it only contains the following, replacing each username with your username
\username, "|/usr/bin/vacation username"
Either delete ~/.forward or return the .forward contents to what it was before changing it when enabling Vacation.