Enable the vacation responder through Gmail using your web browser:
Sign in to Gmail using your web browser.
Click the gear icon in the upper-right corner and select Settings.
From the General tab, scroll down and select Vacation responder.
Set the First and Last day.
The responder starts at 12:00 AM on the First day and ends at 11:59 PM on the Last day.
Complete the Subject: and Message: fields.
If a signature is configured in Gmail it will automatically be appended to replies.
Check Only send a response to people in my Contacts or
Only send a response to people in Lamont Doherty to restrict responder replies.
Click Save Changes.
The responder replies the first time and again after four days or if any changes are made to the vacation responder.
Disable the vacation responder:
While the responder is active the Gmail page will display a banner with the subject and the option to disable the responder. Click End Now on the banner to disable the vacation responder.
Gmail can be forwarded to some other email accounts. Google mail forward.
You can apply a filter to a selected email (or a group of emails). Gmail filter instructions.