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--- a/ForgeTracker/forgetracker/model/ticket.py
+++ b/ForgeTracker/forgetracker/model/ticket.py
@@ -161,7 +161,7 @@
 
     @property
     def email_address(self):
-        domain = '.'.join(reversed(self.app.url[1:-1].split('/')))
+        domain = '.'.join(reversed(self.app.url[1:-1].split('/'))).replace('_', '-')
         return '%s@%s%s' % (self.ticket_num, domain, common_suffix)
 
     def commit(self):