Laura Atkins:
The OP asked for advice on delivery, not his SPF setup. His SPF setup is
fine and is absolutely not the problem here.
There is one, he should at least change "-all" to "?all" (or perhaps
"~all"). And by the way this wasn't the only advice I gave. I never
wrote "do this and your problem will be solved", it's evidently only a
small part of the problem.
And, in all honesty changing from his more exact and specific SPF record
to a vague one that indicates the record is just in testing mode is not
going to improve anything.
Sorry, but "?all" does not mean "testing mode".
The issue is the unexpected emails to new recipients. Overall, the
advice to contact the recipients (it’s only 15) and have them check
their spam folder and move the message out is what’s going to fix things
the fastest. Also, the recipients should be putting the from address in
their address books. Another good way to get the messages whitelisted
for those recipients is to have the user reply to the message or have
some level of discussion with the sender.
Sorry, but the OP experiences delivery issues with Gmail servers, so
suggesting him to solve the issue by contacting the recipients of that
particular email is just nonsense. It won't improve anything for the
other emails he or his wife will send. Or are you perhaps expecting that
in the future they contact each recipient of their emails with the same
request, say tomorrow when they want to contact a college which happens to
use G Suite to enroll their daughter or son? Putting the sender address
in the recipient address book is a myth, it doesn't improve anything.
The same holds for the third advice, having a discussion with someone has
little or no effect on spam filters. I've once seen a case where someone
with a setup similar to that of the OP could not exchange with his brother
or sister, his replies were systematically flagged as spam by Gmail.
Gregory
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