Our email server was compromised and with the help of Microsoft we were able to cleanup the server, eliminate the trojans and/or bots, and I am in the process or installing a new firewall. During the cleanup process I contacted the three blacklisted companys that had our IP blacklisted. I was able, fairly quickly, to rectify two out of the three. However, the last company mentioned that according to "best practices" we should change our Revese DNS from the AT&T....blah,blah,blah designation to mail.ourdomainname.com.
Here's my questions: We are running SBS 2003 with Exchange 2003.
1. I can do this, but do i also have make any configuration changes in Exchange, if so, please detail where is specify the reverse DNS
2. Once done this DNS change is made do we need to wait until the propogation (24-48 hrs) is complete before we can send email?
Thanks in advance for your assistance...