In case anybody's interested for your own reference: DISCOVERED PROBLEM: - I was sending to a hotmail account and Microsoft has intensive anti-spam software. For further info, Hotmail website for postmasters:( http://postmaster.msn.com/cgi-bin/dasp/postmaster.asp?ContextNav=Senders) - My e-mails were being catalogued as SPAM (probably because it was coming from a domain not registered in any DNS) and because same message was being sent in 15 minute intervals (to only 1 e-mail account, though) - The e-mails I was sending were not being delivered to the Hotmail Junk E-Mail folder thus I was not alerted that they were being delayed (potentially some deleted, I'm not sure). RESOLUTION: - Added the sending e-mail address to Hotmail Junk E-Mail allowed list and this allowed a lot more through (I still lost some duplicate e-mails sent at almost the same time, but they may come in later) - DECIDED NOT TO SEND TO A HOTMAIL ACCOUNT. I send to my ISP e-mail account and have added the sending address to their SPAM filter allowed list and EVERYTHING WORKS FINE! Michael -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list