[MM3-users] How to hide sender completely

Dear community,

Could anyone tell me whether there is a way to hide the sender address of list mails completely from the recipients.

Even for an anonymous list, the sender still occurs in two fields

envelope-from <sender@sender-domain.tld> X-MailFrom: sender@sender-domain.tld

of the mail header. Is there a way to suppress this information?

Best wishes, Roland