I recently got a new customer that can't send us email. I see a log that says SPF check failed, and that's all it says. If they can't send to me, I'm thinking it would be their SPF record causing the problem. I have never dealt with SPF records, so I'm a newbie here. We are having no issues sending emails, and this one domain seems to be the only domain having issues sending us emails. I see a txt record in my DNS that says the following:
v=spf1 mx -all
its been there for years, I've never quite understood it so I never got rid of it. Any ideas on what this means?