Invalid Recipient


#1

Got a curious message after sending to 2 valid email addresses. Please note I have changed the actual email addresses and names but they are both valid and reachable when I email them form another account.

Your message did not reach some or all of the intended recipients.

  Subject:  Draft of proposed contract

  Sent:     4/21/2014 2:52 PM

The following recipient(s) cannot be reached:

  Joe Johnson Esq. (joeJ@company.com) on 4/21/2014 2:52 PM

        Invalid recipient

  Sandra Swanson (swanson@ab-digital.com) on 4/21/2014 2:52 PM

        Invalid recipient

What could be the cause?

Thanks!