If you can identify the site being used for verification that might be helpful.If any mail servers were blocked the sender would always get a bounceback error from us. There is no way for us to tell what happened to the message once the sender hands it off to their server. The only folks who can check is the mail administrator for their mail servers. They can see from the server's logs what has transpired during the email transmission. Please have the sender to contact their mail provider to investigate and view their transmission further.
I'm happy to report that as of last night I'm receiving emails from the board again. There's no indication of what specific action turned them on again.cloudmark.com
we're working on it