I am installing a fresh 17.x Listserv on RHEL and I have it mostly working.  One issue though is that it the listserv is not setting the from address, but instead leaving it blank.  I am trying to use Sendgrid as my SMTP server and they require this field to map to an approved domain, which it is not.  Can anyone guide me on how to resolve this?

ec 13 20:15:03 ip-10-10-0-224 postfix/smtp[3190]: < smtp.sendgrid.net[167.89.115.53]:587: 235 Authentication successful
Dec 13 20:15:03 ip-10-10-0-224 postfix/smtp[3190]: smtp_stream_setup: maxtime=300 enable_deadline=0
Dec 13 20:15:03 ip-10-10-0-224 postfix/smtp[3190]: > smtp.sendgrid.net[167.89.115.53]:587: MAIL FROM:<> SIZE=10752
Dec 13 20:15:03 ip-10-10-0-224 postfix/smtp[3190]: > smtp.sendgrid.net[167.89.115.53]:587: RCPT TO:<[log in to unmask]>
Dec 13 20:15:03 ip-10-10-0-224 postfix/smtp[3190]: > smtp.sendgrid.net[167.89.115.53]:587: DATA