diff --git a/outbox.py b/outbox.py
index 11d595c6e..b95a2cd89 100644
--- a/outbox.py
+++ b/outbox.py
@@ -77,6 +77,13 @@ def postMessageToOutbox(messageJson: {}, postToNickname: str,
     if messageJson.get('object'):
         if isinstance(messageJson['object'], dict):
             if messageJson['object'].get('content'):
+                # replace all semicolons, because for mysterious
+                # reasons this appears to create a problem for
+                # webservers receiving the POST
+                if ';' in messageJson['object']['content']:
+                    messageJson['object']['content'] = \
+                        messageJson['object']['content'].replace(';', ',')
+
                 if dangerousMarkup(messageJson['object']['content'],
                                    allowLocalNetworkAccess):
                     print('POST to outbox contains dangerous markup: ' +