Hi,
I will audit setting of PMTA and mailwizz,fix it and implement all mailing techniques too.
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
I will do IP warm up too.
Thank you