Supported SMTP headers

You can use the following SMTP headers with Inboxroad:

SMTP Headers:

  • Date: Indicates the date and time when the message was sent.
  • From: Specifies the email address of the sender.
  • To: Specifies the email address of the recipient.
  • Subject: Contains a brief description or subject of the email.
  • Message-ID: A unique identifier for the message.
  • In-Reply-To: References the message to which the current message is a reply.
  • References: Contains a list of message-ids for previous related messages.
  • Return-Path: Specifies the email address to which bounce notifications should be sent.
  • MIME Headers (Common Email Headers):
  • Content-Type: Describes the type of content within the email (e.g., text/plain for plain text, text/html for HTML, multipart/mixed for mixed content).
  • Content-Disposition: Defines how the email’s content should be displayed or processed (e.g., inline or as an attachment).
  • Content-Transfer-Encoding: Specifies how the message body is encoded (e.g., base64, quoted-printable).
  • Content-ID: A unique identifier for inline content within the email.
  • Content-Language: Specifies the language of the email content.
  • Content-Description: Provides a brief description of the email’s content.
  • MIME-Version: Indicates the MIME version used in the email (e.g., MIME-Version: 1.0).

 

Additional Headers:

  • Reply-To: Specifies the email address to which replies should be sent, which may differ from the sender’s address.
  • CC (Carbon Copy): Specifies email addresses of additional recipients who should receive a copy of the email.
  • BCC (Blind Carbon Copy): Specifies email addresses of additional recipients who receive a copy of the email but are not visible to other recipients.
  • X-Headers: Custom headers that can be added for specific purposes. These are not standardized but are sometimes used for various purposes by email clients and servers.
  • Custom X headers can be added. You might need this to match the feedback to the specific emails / campaigns etc.
  • We have the following custom X headers that can be used to your liking. They will only show up when they contain information.
    • header_X-Job
    • header_X-List
    • header_X-CAMPAIGN