On 18/11/20 13:25, Viktor Dukhovni wrote:

Yes, it has four MX hosts, which have IPv4 addresses, and Postfix
when not misconfigured to bypass MX lookups and not behind a flaky
DNS resolver will by default use these MX hosts with no special
non-default settings.

Postfix is not allowing to send emails to schools.gov.sg.

No, your configuration or nameserver is doing that, not Postfix.

What configuration should be done to make postfix send emails to
schools.gov.sg?

The default configuration.

I will check the DNS resolver and check not to bypass MX lookups.

The advice has put in the right path to check and test. Saved me much time and effort.

Thank you for the advice. I really do appreciate it.

P.V.Anthony



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