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TD;DR: Everything seems perfectly fine, except that people cannot unsubscribe, they are redirected a blank page.
Here is an unsubscribe link for example: link
I generated it using the [unsubscribe] shortcode.
Everything seems to work fine except that. Web preview works link, link tracking also. I can even see that the unsubscribe link got clicked, but no one got unsubscribe.
It's an apache server running on ubuntu.
I see nothing suspicious in my error log (even with LogLevel debug) and here is how the vhost is configured:
Options Indexes FollowSymLinks MultiViews
allow from all
The problem is you've spelled '[unsubscribe]' incorrectly. You've spelled it as '[unsuscribe]'. If you visit the unsubscribe link http://sendy.polydea.pro/l/5x2B1j8OqYnZ9iRS2d1Lvg/S6tD9Q6yHfpwgF58BObCBA/1h1CU5mP74WQyZIFdgNYIQ, you'll see that it redirects to '[unsuscribe]' (incorrect spelling). That is why the unsubscribe tag isn't parsed into an actual unsubscribe link.
Thanks a lot.
Sorry for disturbing you with that silly thing. I spent hours checking server configurations …
Thanks again, and congrats for your customer care.