Marketo not sending me internal tests

Can you describe what you are doing and what is happening?

Happens to me all the time with sample emails, a weird hack I discovered is that if you make your email operational Marketo will always send you a sample, with marketing emails it often stops doing that after 2-3 tries, so I either make the email operational for the time I am testing it (there is always a risk of forgetting to change it back before sending it out though) or I send it to a few of my personal email adresses I created just for this purpose

The usual cause of this is forgetting to include an unsubscribe link in your footer (or the footer that contains this).  Marketo does not warn you when you forget to do this.  The email will simply not be delivered.

Please contact Support and we can provide bounce or delivery codes for your sample sends.  90% of the time the email is successfully sent and accepted by the recipient server which then tosses it in Spam or Quarantine or something like that.  The other 10% is either a soft/hard bounce because the recipient server doesn't like the email or because there was something malformed in the reply-to or from address in the email.