Please note that only one vacation message auto-reply will be sent to a specific email address. You must clear the ‘Replied Addresses’ in order for someone you have already sent a vacation message to – for them to receive another.
Log in to web mail. Then click Rules.
Click on Set your vacation message.
Select Enabled or Enabled Until a specific date. Then click Save.
Click on Clear ‘Replied Addresses’ List. It will be grey after that.