MSH Out of Office Assistant is a solution which extends Postfix and Sendmail functionality with client side auto replies.
Mail Client Extension
Mail client extension seamlessly integrate with Mozilla Thunderbird.
Central OOF Administration
Administration application provide central management of server settings and users out-of-office assistant settings. Loop protection and prevention of sending auto respond to mailing lists or spam settings can be easily configured with it.
To learn more visit MSH Postfix Autoresponder website.