Can my message remain unconfirmed even though my recipient viewed my message?
Yes. In the following situations a recipient may have read your message without triggering the Mailinfo delivery confirmation:

The recipient is using "Mailinfo Confirmation Blocker".

The recipient read the message while being offline.

The recipient reads his messages in a plain text mode.

The recipient is using an email client that does not accept HTML or does not fully display HTML content or images.
For example, Microsoft Outlook 2003 allows users to view HTML messages without related images.

You have set the Advanced Setting "Do not confirm delivery if a message is viewed for less than X seconds" such that the recipient may have viewed the message for a shorter period of time than the minimum required by the setting.
Related Topics
Is it possible for my recipients to read my message without triggering Mailinfo delivery confirmation?

Defining unconfirmed messages

Defining 'Viewed' Email

I'm sure they got my email, why didn't I receive an alert?

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