I can't send email to a few places that are doing reverse DNS lookup because something is up with how my mail server is viewed from the outside and I can't figure out how to fix it.
The mail serve name is MAIL and is located behind a firewall on the company.com domain.
The public domain name is companyinc.com.
In DNS I have a host record of xxx.xxx.xxx.xxx for MAIL with a parent domain of companyinc.com, a MX record for mail.companyinc.com and an Alias of email with a target host of mail.companyinc.com.
So, when a person receives an email from me@companyinc.com, the IP address is that of the global address for my outside router and not the xxx.xxx.xxx.xxx. A reverse DNS lookup works, but if the mail server is checking to see if the sending server is the same as the reverse DNS lookup then they don't match and the email does not go through.
Any ideas would be appreciated.
Thanks!!!
The mail serve name is MAIL and is located behind a firewall on the company.com domain.
The public domain name is companyinc.com.
In DNS I have a host record of xxx.xxx.xxx.xxx for MAIL with a parent domain of companyinc.com, a MX record for mail.companyinc.com and an Alias of email with a target host of mail.companyinc.com.
So, when a person receives an email from me@companyinc.com, the IP address is that of the global address for my outside router and not the xxx.xxx.xxx.xxx. A reverse DNS lookup works, but if the mail server is checking to see if the sending server is the same as the reverse DNS lookup then they don't match and the email does not go through.
Any ideas would be appreciated.
Thanks!!!