I once had this problem with another company and I'm going to share it
here just in case it resonates with anyone:
Despite my NS records pointing to newer servers for years, one day this
company (of noteworthy size and fame) queried ns1.mydomain.tld and
insisted on using the values returned by it until I went back and forth
with them for what I believe was a few weeks. So when I migrated a
server to new IP, everyone using OpenD... I mean this company, failed to
resolve the server.
On 2024-05-02 16:13, Jason R Cowart via mailop wrote:
Is anyone from the Apple email team here by chance? If so, please
contact me off list.
It appears that Apple is sending to our users via a legacy mail server
that is no longer in our MX record.
Thanks,
Jason Cowart
Stanford University
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