![]() There’s also reverse DNS/PTR that needs to be in place. If your server announces itself as “HELO ” and that is resolvable, but it resolves to a completely different IP or IPs other than the one your server connects from, that is also a signal that you might be a spammer and some servers will reject on that basis. your server is saying “HELO ”) then some servers will reject on that basis. One of the things is to to a DNS lookup on that host name. The receiving server does a bunch of stuff to tell whether you are likely to be a spammer or not. When your server connects to another server, it announces itself by saying HELO or EHLO and provides a host name. If you have any questions please feel free to ask them in the comments below. However in my experience with customers these are the two most common scenarios.īy now you should have a basic understanding of what an MX record is and how they work. There are numerous different scenarios that exist such as hybrid cloud/direct combinations, ge0-distributed networks, and so on. If your organization uses a hosted cloud service for email filtering, then your MX record would point to their IP address (or an array of IP addresses depending on which service you are using). If your organization receives email directly then your MX record would point to a public IP address for your firewall or internet-facing email server (eg Edge Transport server). Here are a few real world examples of where to point your MX records. Once you understand what an MX record does you then need to consider where your MX record should actually be pointing. Either way the purpose is to give sending email systems somewhere to send messages rather than have to store them and retry later. Or it could be a server hosted by a third party that provides backup MX services. The backup MX may be another mail server in your organization at a secondary site that has less bandwidth available to it.
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