diff --git a/src/views/email.js b/src/views/email.js
index 8b7a66753..4b5df796d 100644
--- a/src/views/email.js
+++ b/src/views/email.js
@@ -588,13 +588,15 @@ angular.module('Application').controller('EmailController', ['$scope', '$locatio
                 provider: $scope.mailRelay.relay.provider,
                 host: $scope.mailRelay.relay.host,
                 port: $scope.mailRelay.relay.port,
-                acceptSelfSignedCerts: $scope.mailRelay.relay.acceptSelfSignedCerts
+                acceptSelfSignedCerts: $scope.mailRelay.relay.acceptSelfSignedCerts,
+                forceFromAddress: false
             };
 
             // fill in provider specific username/password usage
             if (data.provider === 'postmark-smtp') {
                 data.username = $scope.mailRelay.relay.serverApiToken;
                 data.password = $scope.mailRelay.relay.serverApiToken;
+                data.forceFromAddress = true; // postmark requires the "From:" in mail to be a Sender Signature
             } else if (data.provider === 'sendgrid-smtp') {
                 data.username = 'apikey';
                 data.password = $scope.mailRelay.relay.serverApiToken;