How do I change the IP Address that my Mail Server is using?

Long story short, a week ago our Email server was the victim of a Reverse NDR attack and it ended up getting us on some Blacklists. I've made all of the corrections and I've gotten us off all of the blacklists but we still can't email to Yahoo or anyone remotely related to Yahoo.

Would it be possible to change our IP Address so we can start sending email normally again?
Rmumpower00Asked:
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tigermattConnect With a Mentor Commented:

For that, you would need to update your MX records, have your PTR record updated at your ISP and reconfigure your firewall to route inbound and outbound mail to/from your Exchange Server over a different public IP.

If you are positive your configuration issues are resolved, you would be best to simply have Yahoo! unlist from their blacklist instead. This is much easier and won't require mass DNS changes which will take time to propagate.

demazter has a great article on having Yahoo! unlist you here:
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_3719-Yahoo-Blocking-your-mail-server.html

-Matt
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Rmumpower00Author Commented:
Thank you for your answer, I'll try emailing them directly instead of the online form
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