Each email that is sent has a set of header fields called Internet Message Format header fields.  These headers communicate information to the email clients or email servers, such as who the email is from or what the subject is.

You can see these email header fields within your favorite email client.  For example, within Gmail, the Show original option in the menu under a message.  Or within Yahoo, under View Full Header within the More options under a message.  You will see a large number of lines with a name, colon, and some value, these are the header fields.

Autoresponder Max has predefined set of header fields that are needed for proper operation.  These are usually required, identify such as the sender of the email address.  While, the predefined set cannot be modified, additional fields can be defined within the section labeled Additional Email Header Fields of Advanced Settings.  You may want to add a header, for example, set the importance of the email to low.  The customer within their email client might see an indicator that message is low priority.  Though, this is just one scenario, the change to these fields are meant to change how the email client or the delivery of the email is affected.

Advanced Settings Additional Email Header FieldsEach header contains a Name and a Value.  Depending on the Name field, a specific structured Value may be needed (it may have to conform to a standard).  Some headers must not use the same Name twice within a single email.  For each header, please reference the IETF RFC to ensure conformity with any email header field standards.  If you are unsure of the standard format, please contact support to ensure correctness.

Liquid Templating Language is allowed within the Value portion, allowing for the headers to be dynamic.  In the example above used by the Reconnect email campaign, the Name of “References” contains the Message ID from the previous message, this is populated dynamically using Liquid.

Some header fields are not allowed, either because they can be disruptive or there is a separate area within Autoresponder Max to change the value.  Providing a header field could disrupt the delivery of your email.  For example a Name “DKIM-Signature” could be provided, which may prevent from customers receiving email at all.  Please use caution when providing these headers and contact support if any help is needed.

If you need any further explanation of header fields or how they can be used in a particular scenario, feel free to contact support.  We hope you have a wonderful experience with Autoresponder Max!