diff --git a/dist/comment_notification.html b/dist/comment_notification.html
index 302376e..4895243 100644
--- a/dist/comment_notification.html
+++ b/dist/comment_notification.html
@@ -144,6 +144,14 @@
     
     .preheader {
       display: none !important;
+      visibility: hidden;
+      mso-hide: all;
+      font-size: 1px;
+      line-height: 1px;
+      max-height: 0;
+      max-width: 0;
+      opacity: 0;
+      overflow: hidden;
     }
     /* Attribute list ------------------------------ */
     
diff --git a/dist/example.html b/dist/example.html
index 11b8db9..d4cf263 100644
--- a/dist/example.html
+++ b/dist/example.html
@@ -144,6 +144,14 @@
     
     .preheader {
       display: none !important;
+      visibility: hidden;
+      mso-hide: all;
+      font-size: 1px;
+      line-height: 1px;
+      max-height: 0;
+      max-width: 0;
+      opacity: 0;
+      overflow: hidden;
     }
     /* Attribute list ------------------------------ */
     
diff --git a/dist/invoice.html b/dist/invoice.html
index d5987b8..a70c1b6 100644
--- a/dist/invoice.html
+++ b/dist/invoice.html
@@ -144,6 +144,14 @@
     
     .preheader {
       display: none !important;
+      visibility: hidden;
+      mso-hide: all;
+      font-size: 1px;
+      line-height: 1px;
+      max-height: 0;
+      max-width: 0;
+      opacity: 0;
+      overflow: hidden;
     }
     /* Attribute list ------------------------------ */
     
diff --git a/dist/password_reset.html b/dist/password_reset.html
index 3a6c39c..1e9bce4 100644
--- a/dist/password_reset.html
+++ b/dist/password_reset.html
@@ -144,6 +144,14 @@
     
     .preheader {
       display: none !important;
+      visibility: hidden;
+      mso-hide: all;
+      font-size: 1px;
+      line-height: 1px;
+      max-height: 0;
+      max-width: 0;
+      opacity: 0;
+      overflow: hidden;
     }
     /* Attribute list ------------------------------ */
     
diff --git a/dist/password_reset_help.html b/dist/password_reset_help.html
index 6ba3e29..3afc15b 100644
--- a/dist/password_reset_help.html
+++ b/dist/password_reset_help.html
@@ -144,6 +144,14 @@
     
     .preheader {
       display: none !important;
+      visibility: hidden;
+      mso-hide: all;
+      font-size: 1px;
+      line-height: 1px;
+      max-height: 0;
+      max-width: 0;
+      opacity: 0;
+      overflow: hidden;
     }
     /* Attribute list ------------------------------ */
     
diff --git a/dist/receipt.html b/dist/receipt.html
index e078da7..d30c00e 100644
--- a/dist/receipt.html
+++ b/dist/receipt.html
@@ -144,6 +144,14 @@
     
     .preheader {
       display: none !important;
+      visibility: hidden;
+      mso-hide: all;
+      font-size: 1px;
+      line-height: 1px;
+      max-height: 0;
+      max-width: 0;
+      opacity: 0;
+      overflow: hidden;
     }
     /* Attribute list ------------------------------ */
     
diff --git a/dist/trial_expired.html b/dist/trial_expired.html
index aff791e..c77d02e 100644
--- a/dist/trial_expired.html
+++ b/dist/trial_expired.html
@@ -144,6 +144,14 @@
     
     .preheader {
       display: none !important;
+      visibility: hidden;
+      mso-hide: all;
+      font-size: 1px;
+      line-height: 1px;
+      max-height: 0;
+      max-width: 0;
+      opacity: 0;
+      overflow: hidden;
     }
     /* Attribute list ------------------------------ */
     
diff --git a/dist/trial_expiring.html b/dist/trial_expiring.html
index 94675f0..27d85e6 100644
--- a/dist/trial_expiring.html
+++ b/dist/trial_expiring.html
@@ -144,6 +144,14 @@
     
     .preheader {
       display: none !important;
+      visibility: hidden;
+      mso-hide: all;
+      font-size: 1px;
+      line-height: 1px;
+      max-height: 0;
+      max-width: 0;
+      opacity: 0;
+      overflow: hidden;
     }
     /* Attribute list ------------------------------ */
     
diff --git a/dist/user_invitation.html b/dist/user_invitation.html
index 421425f..21e2a9f 100644
--- a/dist/user_invitation.html
+++ b/dist/user_invitation.html
@@ -144,6 +144,14 @@
     
     .preheader {
       display: none !important;
+      visibility: hidden;
+      mso-hide: all;
+      font-size: 1px;
+      line-height: 1px;
+      max-height: 0;
+      max-width: 0;
+      opacity: 0;
+      overflow: hidden;
     }
     /* Attribute list ------------------------------ */
     
diff --git a/dist/welcome.html b/dist/welcome.html
index 9e64d2d..86eb3bc 100644
--- a/dist/welcome.html
+++ b/dist/welcome.html
@@ -144,6 +144,14 @@
     
     .preheader {
       display: none !important;
+      visibility: hidden;
+      mso-hide: all;
+      font-size: 1px;
+      line-height: 1px;
+      max-height: 0;
+      max-width: 0;
+      opacity: 0;
+      overflow: hidden;
     }
     /* Attribute list ------------------------------ */
     
diff --git a/src/stylesheets/global.css b/src/stylesheets/global.css
index dbca957..8f047d9 100644
--- a/src/stylesheets/global.css
+++ b/src/stylesheets/global.css
@@ -104,7 +104,15 @@ td {
   padding: 35px; }
 
 .preheader {
-  display: none !important; }
+  display: none !important;
+  visibility: hidden;
+  mso-hide: all;
+  font-size: 1px;
+  line-height: 1px;
+  max-height: 0;
+  max-width: 0;
+  opacity: 0;
+  overflow: hidden; }
 
 /* Attribute list ------------------------------ */
 .attributes {