Am I wrong to use as my IP Address

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The admin guide in section 7.2 Incoming Mail says “If you are only using one domain (the root domain), you don’t have to make an entry here and the localhost value ( will be used by default.” Am I wrong to use I am only using one domain.

Answer is the “loopback” address and always refers to the local machine. If you are standalone and not networked this is fine.

If you are networked you must use the machine’s real IP address. The problem is, every machine thinks it’s, so it’s no good as an idenitifier. For example, mail to another server would send as the source IP and messages would appear to come from “localhost” instead of the real machine name – this might give you strange problems sending mail esp if the remote server attempted to authenticate your machine in a DNS.

Use the primary IP address of the machine.

Keywords:localhost, IP Address,

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