- Many companies have multiple IP addresses. To split the traffic to different servers and lines, they use IP 1 is for sending emails while IP 2 is for receiving. Therefore, the company's domain MX record does not contain IP 1.
- Some companies use mail service from a third party, which separates the inbound and outbound mail MTAs. Outbound MTAs do not accept any inbound mail, thus, clients cannot add outbound MTAs to their MX record.
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"Reject unknown IP address" option does not work in InterScan Messaging Security Virtual Appliance (IMSVA)
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