Anyone Have Experience Using Exim < 4.90.1 - 'base64d' Remote Code Execution

[Merl]

https://www.exploit-db.com/exploits/44571
Testing out the above exploit but getting stuck at stage 10. It seems to read forever looking for "OK".
Anyone have any suggestions? Overflows are not my strong point.
The following changes were made to the script:
line 44 -> changed localhost in the connect function to the target ip address
line 82 -> changed to my ngrok listening address
line 83 -> changed to my ngrok listening address
Cheers