diff --git a/src/class_pop3Server.py b/src/class_pop3Server.py
index a38249d4..e155d18e 100644
--- a/src/class_pop3Server.py
+++ b/src/class_pop3Server.py
@@ -183,7 +183,7 @@ class bitmessagePOP3Connection(asyncore.dispatcher):
 
         username = '{}@{}'.format(getBase58Capitaliation(self.address), self.address)
 
-        # Must login with the full E-mail address
+        # Must login with the full E-mail address and capitalization
         if data != username:
             yield "-ERR access denied"
             return
diff --git a/src/class_smtpServer.py b/src/class_smtpServer.py
index 5c8817aa..5cbd9c10 100644
--- a/src/class_smtpServer.py
+++ b/src/class_smtpServer.py
@@ -160,6 +160,7 @@ class bitmessageSMTPChannel(asynchat.async_chat):
 
         self.fullUsername = '{}@{}'.format(getBase58Capitaliation(self.address), address)
 
+        # Must match full email address with capitalization
         if username != self.fullUsername:
             self.push('530 Access denied.')
             self.close_when_done()