Explanation/Reference:
Explanation:
Today, most mail exchangers will check this record for each incoming connection and may abort the communication if they find your IP address does not have an associated DNS PTR entry:
Need a ptr record.
Detroit and New York users have direct connection to the internet but not Chicago users.
It appears that via a Send Connector Chicago email is sent to New York mail server.
Given this then the spf txt record listing the New York mail server is correct (131.107.1.200) and there should not be any issues with the Chicago email Once the planned changes have been implemented then the DNS txt record would have to accommodate the Detroit Mail server (EX3) (131.107.2.200) in order for the email to function correctly for Detroit users.
However, the question relates to Chicago users not Detroit users.
D: PTR Record
A DNS PTR record - for those of you who are wondering - is a special entry in the Domain Name System (DNS) that basically maps an IP address (like 65.55.12.249) to a domain name (like wwwco2vip.microsoft.com). Having a DNS PTR record for your IP address is (somewhat) a sign of reliability in the Internet, since only the owner of a specific network zone has the ability to create and edit these DNS records.
Today, most mail exchangers will check this record for each incoming connection and may abort the communication if they find your IP address does not have an associated DNS PTR entry: because of this reason, always suggest to make sure your public servers IP addresses have DNS PTR records configured properly. While EmailVerify.NET can validate email addresses even without a DNS PTR entry configured, the quality of the validation results in this event may be suboptimal.