About responders
A responder is a method of automatically replying to incoming email.
For example, you might want all email sent to your customer service department to receive an automatic reply about your hours and contact information. To do so, you can create an alias called customerservice then create a responder for that alias. Whenever email is sent to customerservice@<yourdomain.com>, the prepared reply is sent automatically.
Responders can be set up for aliases only. They cannot be mapped to individual email addresses without aliases.
You can view, add, change, and remove responders.
Both responders and vacation messages automatically reply to incoming email. However, they have these key differences:
Responders can be set up only for aliases; vacation messages are set up for email addresses.
Vacation messages are sent only once. If users send multiple messages to an email address that has a vacation message enabled, they receive only one automatic reply. Messages sent to aliases using responders receive replies each time the message is sent.