Dear Employer,
1) When you assigned the 16 IP were they used in a rotation?
2) You can't test the emails in bulk more that 1000/hr. you will need to chunk the files and use.
About myself,
Worked as below;
Hungama Digital Media and Ent. Pvt Ltd as Junior Linux Linux Admin worked on AWS servers
Kennovation services Pvt Ltd as System Administrator worked on H/W servers.
Opendr Business Services Pvt Ltd as System Eng worked on digitaloceans and Firehost cloud servers.
Overall 6 yrs of exp in Linux and 3.5 yrs in LAMP, MySQL troubleshooting and tuning and SVN server installation and configuration with Apache and ssh and email marketing