Friday, July 4, 2014

Prevent of an auto-responder loop

An email loop is an infinite loop phenomenon, resulting from mail servers, scripts, or email clients that generate automatic replies or responses. If one such automatic response triggers another automatic response on the other side, an email loop is created. The process can continue until one mailbox is full or reaches its mail sending limit. In theory, the email loop could last indefinitely. Email loops may be caused accidentally or maliciously, causing denial of service. Although rare, email loops involving more than two participants can also occur. - Wikipedia

Configure Email Loop Protection


ELP can be set and configured with Rule Wizard on Protection tab. Application count how many times an auto reply was sent to the same recipient in specified time interval.

Email Loop Protection in Wizard Rule.

Time interval:
  • minute
  • hour
  • day
  • week

What is MSH Autoresponder?


MSH AR it's a milter which extends Postfix, Sendmail and Zimbra mail server. It give capabilities to set server side autoreplies based on many conditions, like:
  • sender,
  • recipient(s),
  • header(s),
  • subject,
  • time range;
Together with built-in Administrator Panel powerful gui application, server administrator (or authorized user) can define many rules for auto messages, like:
  • out of office states for single mailboxes,
  • vacation auto replies,
  • common marketing or support replies;


Find out more about MSH Autoresponder for your mail server...