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I've had a successful email campaign series setup using Universal Analytics with the /collect img code for open rate, except there are two emails that are mysteriously not tracking.

Tracked opens properly:

<img src="" />

Did not track opens:

<img src="" alt="">

...and the other was cn=Newsletter+2014+02+Open, the similarity of which makes me wonder if it is something so simple as the naming convention of the campaign. However I can't find locate anything about disallowed names.

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