I would prefer you post that as q real question, if it needs chatting then we (or you and someone more knowledgeable about these matters) can come back here. That way others more easily have access to the information. Make sure to describe the question including what MTA you are using.
Sorry I think you might be on the wrong site, please re-read my preference and read up on what StackExchange is about: unix.stackexchange.com/tour
I don't mind helping out others, but doing so in a chat makes it obtuse and is asking for repeat questions as it is not easy to search a chat, nor has it a clear mechanism of combining (good) answers with questions especially if there are multiple ones.