Proxmox mail gateway rejected some emails claiming SPF failure.
The one thing about computing is that it is so literal. I wish programmers would add some intelligence into their products, yet allow us to override it. In this case for a customer a user attempted to forward an email from her old email account to the one I set up on their very own email server. It worked great, but I didn't have the proxmox mail gateway put in place. When I set this up I immediately got a message from her telling me that the forwarded message didn't go through to the new server, that it had rejected it and sent her a reject message. She forwarded me the rejected email and I looked it over and found that it said SPF failure. I checked her registrar's DNS…