best practices to protect mail server from DoS Attack

Hi
Please prove  best 10 practices to protect  mail server from DoS Attack
dhanush_supportAsked:
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Vijay Pratap SinghConnect With a Mentor Commented:
1.  Block ping to server.

2. block telnet

3. not use 3rd party free email apps

4.  install firewall

5.  install antivirus and spam protection

6.  dnt install gui on server if linux

7.  accept mails from SaaS provided IP's

8.  set lower SYN, ICMP, and UDP flood drop thresholds

9.  timeout half-open connections more aggressively

10. add filters to tell your router to drop packets from obvious sources of attack
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