I try to send an invitation to a vendor to complete the profile as a translator and I get this back:
Your message(s) did not reach intended recipients.
SUBJECT: "Complete your registration!"
CREATED AT: 2019-04-01 14:52:11.424
LAST ERROR: 554 5.7.1 <firstname.lastname@example.org> Relay access denied.
Customer support service by UserEcho