Open-rate is measured for HTML and multi-part messages only AND if the Track open rate for HTML and multi-part messages box (under Tracking and reporting) is checked for the messages you want to track.
If you are sending each message in different formats (plain text, HTML, and/or multi-part) based on your contact's format preference, those who opted to get them in plain text will not be counted even if they actually opened the messages.
For a more accurate open-rate figure, always set the format of your messages to HTML or multi-part.
If you will be setting the format of the messages to Contact's format preference, then make sure that:
- The format preference of your contacts is either set to HTML or No preference
- The Format to send when contact has no preference setting is set to HTML or multi-part
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