I think I’ve figured it out. Some email servers have very strict spam requirements, and I hadn’t set up our MX records properly (https://www.wikiwand.com/en/MX_record). This caused the emails to go through for a large majority of users, but not some who had custom domain setups with strong spam filters. This should be fixed now.
I’ve done that. Still haven’t gotten an email. I’ve checked my spam folder.
I think I’ve figured it out. Some email servers have very strict spam requirements, and I hadn’t set up our MX records properly (https://www.wikiwand.com/en/MX_record). This caused the emails to go through for a large majority of users, but not some who had custom domain setups with strong spam filters. This should be fixed now.
Really sorry for the trouble.
I’m in!
Thanks very much.