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Postbox seems to not allow cookies from secure content.

From my tests it appears Postbox is having the same problem Thunderbird did awhile back. https cookies seem to be stripped from headers, otherwise known as bugzilla bug 477120 applies to (https cookies being stripped).

While I cannot test and confirm that this is the case 100%, it sure looks like this is what is happening.
 
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The company marked this problem solved.


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