Have you swapped the ports as mentioned in 2.3.2?
with MS Exchange you should not use port 26 for outgoing so you have to
switch these two values (25 and 26) . In the end you have to
use port 25 for outgoing and port 26 for incoming mails.
I think it is the other way around with the port numbers:
Outgoing : Users----->(143/993/110/995/587) Exchange----->(26) PMG----->(25) FW-----> Internet
Incoming : Users <----Exchange(25) <-----PMG(25) <-----FW(25) <---Internet
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