Hi,
We will implement as below mailing techniques:-
1. Ip rotation -> Prevent blacklisting
2. DMARC enabled-> For mailing server security
3. Spf ,domain keys enabled-> Increase inbox delivery
4. Reverse dns enabled -> Increase inbox delivery
5. Open relay disabled -> For mailing server security
6. Feed Back Loop Registration Guide –-> Abuse management
7. Ip warm up and Domain Warm up Guide → Increase Domain and IP Reputation
Thank you.