+RSET
+??? 250
+MAIL FROM:<CALLER@bloggs.com>
+??? 250
+RCPT TO:<a@test.ex>
+??? 250
+DATA
+??? 354
+DKIM-Signature: v=1; a=rsa-sha1; c=simple/simple; d=test.ex; h=from:to
+ :date:message-id:subject; s=sel; bh=OB9dZVu7+5/ufs3TH9leIcEpXSo=; b=
+ CoaRNB2Z59hSnhTzT8bYbMIN3P57XAVcFeV5oGEl4aKmhm6Mtu2uIc7B2z9k5+A/
+ +KFIE9HRj7eg9kPzagoPIvI84WE5PN5yRehMjJI6WqhM3V+bQDHkb8ubSmiaYxY5
+ B2Pd/kEGgHUlMDB0Hug4FMMt7GcFxagKspthOT/Pso0=
+From: mrgus@test.ex
+To: bakawolf@yahoo.com
+Date: Thu, 19 Nov 2015 17:00:07 -0700
+Message-ID: <qwerty1234@disco-zombie.net>
+Subject: simple test
+
+This is a simple test.
+.
+??? 250