echo "This is a test." | mail -s Testing foo@test.com -- -f noreply@foo.com

mail('foo@test.com','This is a test.','Testing','From: noreply@foo.com','-f noreply@foo.com');

Received: from www-data by webhost.foo.com with local (Exim 4.86_2) (envelope-from <www-data@webhost.foo.com>) id 1cy3vi-000Dw1-8V for foo@test.com; Tue, 11 Apr 2017 17:06:30 -0500

2017-04-11 17:06:30 1cy3vi-000Dw1-8V <= www-data@webhost.foo.com U=www-data P=local S=835
2017-04-11 17:06:30 1cy3vi-000Dw1-8V => foo@gmail.com R=dnslookup T=remote_smtp H=gmail-smtp-in.l.google.com [74.125.198.27] X=TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128 CV=yes DN="C=US,ST=California,L=Mountain View,O=Google Inc,CN=mx.google.com" C="250 2.0.0 OK 1491948390 f4si7294248oig.334 - gsmtp"
2017-04-11 17:06:30 1cy3vi-000Dw1-8V Completed

trusted_users = www-data