> Mebbe your outgoing SMTP server would be eating up the mail and wont > deliver it to the required destination. Always possible I suppose, except that my mail logs show the messages leaving the server, and this problem is occurring from two different addresses on two completely different networks using different outgoing SMTP servers. My best guess at the moment is that something inexplicable in the messages is causing them to get slamdunked by a filtering system. The messages are just questions about asterisk-ss7.