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I used to develop a largish open-source app in my spare time, but that has come to an end. No energy left... But I sometimes work on a Android app - I needed it for myself so I built it, and published it on Google Play.
If you truly believe you need to pick a mobile phone that "says something" about your personality, don't bother. You don't have a personality. A mental illness, maybe, but not a personality. [Charlie Brooker] My Blog
I have no idea which haystack to even start looking in, or what I'm looking for. Kind of lost here on this one.
I use a linux firewall with nat for 32 ip's, and I'm trying to get my exchange server to send new messages with the proper ip address for reverse dns verification to other mail servers. So that line in the smtp message received from <220.127.116.11> should be <18.104.22.168>
I wrote the iptable script like 8 years ago, but times change, with spam and all that.
so it's either the routing - linux using route netFilter - linux using iptables exchange server - Microsoft
I just posted the question on stack overflow, let's see what happens.
Note: I got the SMTP port wrong in my answer. 21 instead of 25.
Correct me if I am wrong, MX records are for receiving the email, sender's email will have SMTP server's IP Address. and when you reply to the email, it will get resolved from domain name to IP Address using MX records, in order to receive it using IMAP/POP3. so sending and receiving IP Address can be different. (I may be wrong about this).