Proofpoint / SMTP error code 550
smtp;550 5.5.2 <email@example.com>: Sender address rejected: need fully-qualified address (in reply to RCPT TO command)
High severity
Make sure your 'From' and 'Return-Path' (envelope-from used for SPF) domains exist can receive mail.
██▓▒▒▓▓███░▓▒▓▒▒░██▒░▒▒█░░▒█▒▒▒░░░░▓▓▓▓▓▓▓▓▓▓▒█░█░▓░░░█▓▒▒▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▒░▒█▒░▒▒▒█▒▓▓▓▓▓▓▓▓▓░▓░▓▒░░▒▒█░░▓▓▓▓▓▓▓▓▓▓▒░▒▒█▒██░▒█░▓░░▓▒▒▒░░░▓█░▒░█▓▓▓▓▓▓▓▓▓▓▒▓▒██▓▓░░▓▓▓▓▓▓▓▓▓▓░▓█░▓▓▓▓▓▓▓▓▓▓░░░░▓▓▓▓▓▓▓▓▓▓▒░▒▒▒█▓▓░▓▓▓▓▓▓▓▓▓░▓░░░█▒▒█▓▓▒▓▒▒▒▒▒▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░█░▒░█▓▒▒▒▒█░▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▒░░▓▓▒▒▓▓▓▓▓▓▓▓▓▓██▒▒▒░▒▓▓█▓▒░▒▓░▓▓▓▓▓▓▓▓▓▓▓▒▒▒▓▒░▓▓▓▓▓▓▓▓▓░█░▓█▓▓▓▓▓▓▓▓▓▒░█▓▒▒░░░▓▓▓▓▓▓▓▓▓▓▓█▒░▓▓█▓▓▓▓▓▓▓▓▓▓░░█░▒▓▓▓▓▓▓▓▓▓░▒▒█░▓░▒▒▓░░░▓▓░▒▒░░▓█▒▓▒▓░▓░▒▒░░▒█▒▒░▓▓▓▓▓▓▓▓▓▓▓▓▓▒▒▒▓▓▓▓▓▓▓▓▓▒▓▒▒▒░▒▓▓▓▓▓▓▓▓▓▓██▓▓▓▓▓▓▓▓▓▓▒▒░░▓▓▓▓▓▓▓▓▓░▒░▓▓▓▓▓▓▓▓▓▒░░▒▓▓▓▓▓▓▓▓▓░░░▒▓▓▓▒▒▒▒█▒░░▓▓▓▓▓▓▓▓▓▓▓▒░▓▓▓▓▓▓▓▓▓▓▒▓▓▓▓▓▓▓▓▓▓█▒░███▒░░▓▒▒▓▓▓▓▓▓▓▓▓██▒▒▒▒░░▓▒▓▓▓▓▓▓▓▓▓▓▓▓▒▓▒▒▒░░▒▒▓░░▒▓▒▓░▓▒░▓▓▓▓▓▓▓▓▓░▒░░▒▓▒▓█▒▒▓██░░▒░▒▒▒█▓▓▓▓▓▓▓▓▓█▓░▓█░▒▒▓▓▓▓▓▓▓▓▓█▓▒░▓▓▒▒▒▒▒░█░▒▒▒▒▒▓▒▓░▓▓▓▓▓▓▓▓▓█▓░▓░░██▒██░▓▓▓▓▓▓▓▓▓▒▓█▓░░░█▒▒▒▒▓▓▓▓▓▓▓▓▓░█▒▓▓▓▓▓▓▓▓▓█▒▒░▒▒▓▓▓▓▓▓▓▓▓▒▓▓▒█▓▓▒▒░█▓▒░▓█