We're aware of a bug in Apple Mail, that results in image links of sent mails not being triggered when clicked.
Apple have fixed this issue in the new Mail client available in Mac OS X 10.10.3. Please update via the Apple Public Beta Program or wait for the update to be officially released.
In the meantime you can send your mails using the built-in mail feature. Don't know how? See the manual for more info.
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