Hi Wietse,
On 2023-12-29 18:36:59 +0100, Wietse Venema via Postfix-users wrote:
Peter Wienemann via Postfix-users:
On 2023-12-15 22:17:08 +0100, Wietse Venema via Postfix-users wrote:
There is no such thing as falling back to A or AAAA records after
trying MX records. The two are mutually exclusive.
I am confused by the last two sentences. Let us consider a relay host
And then shows some examples that deminstarte that the using
MX records is mutually exclusive with using address (A or AAAA) records.
I think what bears the potential for confusion is what you mean by
"trying MX records". In my opinion the example showed that MX lookups
are always tried, even if MX records are not present and thus finally
destinations specified by A or AAAA records are used for delivery
attempts. In that sense MX and A/AAAA (DNS) trials are not mutually
exclusive. What is mutually exclusive is the subsequent delivery
attempt. Either destinations specified by MX records are tried if there
are any or otherwise delivery is attempted to hosts specified by A/AAAA
records.
There is no way that Postfix will deliver to d2 (example2.com)
before d1 (example.com).
Thanks for this clarification. I think all my questions are answered now.
Best regards,
Peter
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