Interesting note that we also saw this a few weeks ago too and had to
add DKIM to get mail to work to domains that only had SPF.
On 4/19/2022 3:20 AM, Andre van Eyssen via mailop wrote:
A little testing shows that gmail appears to be rejecting all mail
from domains with no SPF record. Having them create the SPF record
returned their domains to deliverability in about an hour.
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