Somyrion users who are registering with specifically hotmail/outlook email addresses are not receiving their validation/activation emails
I complained with Mailgun and they've moved my account to a different IP, which seems to have resolved the issue.
Now, I'm baffled that they don't monitor these problems themselves. Granted I have a free account ? But the whole point in using their service (and eventually upgrading to a paid account) is that they take care of mail delivery.
Let me know if you experience other mail issues.