Question
When formatting the /etc/mailhelo file, what syntax format does this need to be in?
Answer
The /etc/mailhelo file contains Exim’s configuration for the HELO command, which initiates dialog between a mail server and a client. This file governs which domain sends the HELO command.
Use your preferred text editor to create an /etc/mailhelo file that resembles the following example:
- example.com: example.com
- sub.example.com: example.com
- example.net: example.net
- addon.example.net: example.net
- *: hostname.example.com
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