I know the recipient of the invitation is receiving it. The attempts to respond are time-stamped shortly after I send the invitation (I¡¯ve sent two). This notice comes up in the ¡°Sent Invitations¡± area, where we can see if an invitation has been accepted.
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I decided to ask the person for a different email address.
That's not all that unusual.? It means that there's a problem on the other end and the message isn't being delivered.? It's normally a temporary thing (the deferred part), though it can take some time to work right.? All you can do is keep trying to see if it will eventually go through.