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mcedit /etc/exim4/exim4.conf.template
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hostlist relay_from_hosts = 127.0.0.1 : 123.123.123.123
In the end, run:
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systemctl restart exim4
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mcedit /etc/exim4/exim4.conf.template
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hostlist relay_from_hosts = 127.0.0.1 : 123.123.123.123
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systemctl restart exim4