So, relayhost = mail.example.net without '[]' will lookup MX records for mail.example.net?

Thanks.

On 2024-07-25 11:12, Serhii via Postfix-users wrote:
From postfix docs: "The form [hostname] turns off MX or SRV lookups."

https://www.postfix.org/postconf.5.html#relayhost

On 7/25/24 09:09, Corey H via Postfix-users wrote:
Hi list,

I saw this configuration in my company's postfix.

relayhost = [mail.example.net]:587

Generally I would write it as:
relayhost = 1.2.3.4

but what does this mean with '[]' and hostname in it?

Thanks.
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