We’ve implemented Auth0 into our systems and it mostly works fine - both our outlook and gmail accounts receive their emails consistently and fine with Sendgrid.
However, one of our clients seems to be unable to receive our passwordless emails. Sendgrid states they are delivered, we’ve tried turning SendGrid off as well but it makes no difference. They arrive neither to the spambox nor inbox of any employees within their email domain.
They use Outlook and haven’t got an IT department it seems, so there shouldn’t be any arcane configs going on beyond defaults.
Now, we intend to find out what we can but obviously there’s many different companies out there with many different email domains. What are some reasons why the code emails would fail to arrive to accounts within a company?
Our personal emails arrive just fine with them, so we know our domain isn’t blocked, at least… We’ve set all the correct DKIM and SPF records as well.