Zoom refuses to send me a meeting registration for a specific emal address, that used to work

[albuck]

For a couple of years, I registered with Zoom as an attendee for webinars with a specific email address that I also use with the organization doing the meeting.  Suddenly Zoom is eating the registration email and will never send it to me.  I can register with *any* other email address and get the link.  How do I clear this blacklisting/blackholing of an email address?  I run my own email server and I can see every email interaction in the log files.  For this email address, Zoom never even starts to send the email with the meeting URL.  Of course, I still get emails from the organization at that email address without any problems.  Weird.

[hre]

We use salepager.com at our organization for emailing the meeting URL to registered attendees to ensure the link gets delivered.