My question is probably very easy to answer but I have been struggling with this the whole day. Actually, I would like to change my smtp.mail name and account that is shown as sending the emails in the header. I changed the "From" but it shows only in the "visible" part of the email and there are values that are different in the header.
In this example :
Received-SPF: pass (google.com: domain of email@example.com designates 126.96.36.199 as permitted sender) client-ip=188.8.131.52; Authentication-Results: mx.google.com; spf=pass (google.com: domain of firstname.lastname@example.org designates 184.108.40.206 as permitted sender) email@example.com; dkim=pass (test mode) firstname.lastname@example.org
Thank you in advance!