Is it RFC 3834 compliant?
Tutorial / Send email / For version: 7
To prevent mail routing loops we include in version 7 the options to support normalization RFC 3834.
According to Section 5 of RFC 3834:
The purpose of the Auto-Submitted header field is to indicate that the message was originated by an automatic process, or an automatic responder, rather than by a human; and to facilitate automatic filtering of messages from signal paths for which automatically generated messages and automatic responses are not desirable.
Note: You can enable/disable this feature in the options, section 'Advanced'.
Information: rfc 3834, reply, email, robot - Updated the Monday, December 4, 2017