I have previously used Mandrill to send emails. It has worked flawlessly for months. My host seemingly did something to their settings last week, and suddenly any attempt to send via mandrill times out and creates an entry in the error log. Initially I was told by my host this is because they had blocked all ports, except ones requested to be opened by customers. However, I have since been told that the standard ports (25, 587) are wide open and the fact I can still send emails via PHP Sendmail demonstrates this. They are telling me Xenforo must be trying to connect via a non-standard port. Can anyone advise whether this is the case?