My email logs are filling up with bounced emails being sent from my domain with a
From header formatted like so:
What is causing this?
Full log entry:
Mar 13 14:05:09 ip-10-122-201-212 postfix/smtp: 4D21881CA8: to=<root@firstname.lastname@example.org>, relay=email-smtp.us-east-1.amazonaws.com[18.104.22.168]:25, delay=0.12, delays=0.01/0/0.11/0, dsn=5.0.0, status=bounced (host email-smtp.us-east-1.amazonaws.com[22.214.171.124] said: 501 Invalid MAIL FROM address provided (in reply to MAIL FROM command))