I’ve been using Ispconfig 3 for years and I love it. Although recently I’ve had a specific issue using the send copy feature. My standard emails arrive from all domains when sent through imap/dovecot etc but the copy gives a sendgrid error. Sendgrid support said to contact the dev team as the smtp header is replacing the from email with the original so the sender is not matching a domain on their system. Any ideas how i can fix it?