This might not be related, but if you’re using Bluehost or Hostgator, I recommend moving your services elsewhere. Your emails are probably being sent straight to a trash bin and never delivered simply because Bluehost and Hostgator will host known spammers, and you get punished by association.
I recently learned that they let all kinds of spammers host on their shared servers, which leads to a lot of admins blocking them. That means your legitimate emails get outright shredded simply because of association, because they originate on the same server as these spammers.
Bluehost/hostgator (which are owned by the same company) will recognize this as an issue if you call, and will offer that you pay them more to be insulated from this crap that they allowed in the first place.
I’m moving everything I have with them, which is a lot. It will probably take me until August, but learning that this is why over the last five years clients sometimes don’t receive my emails is just too much.
The reason I posted is because I went searching for answers (again, for like the 20th time) when I did the steps suggested in this thread to “verify the DKIM record”. I got that all good to go, but when an InfusionSoft test email to myself from a campaign sequence evaporated into nothing, I looked for more answers. At this point, I am 100% blaming Bluehost for any and all undelivered “known spammer” emails.
If you’re on Bluehost or Hostgator, kick them to the curb as fast as you can. If you’re not, do some searching and check on your host’s reputation for letting spammers get away with hurting your web efforts.