I guess ill have to keep "smtp_tls_security_level = may" commented out for now. Like I said though, its not a fix, its just disabling a good feature.
Its disabling All TLS communication to remote servers even if they support it.
I dont understand why having "may" would cause an issue, surely it just tried, fails and then reverts to plain, but apparently not.
From my research I believe this may be an issue with openssl 1.0.1 but its not my area of expertise and I really dont know where to go from here 
Thanks