Hi   This has happened in the past.  We use this mailbox on Mac only, which is scanned on a daily basis.    Suddenly last week we began receiving hundreds of non-delivery notifications where it was clear that the sender 'name' was NOT our name, yet the sender address was our TPG address.  This is why I am asking why those emails are allowed to be sent by the TPG mailserver (seems to be mailserver 5 specifically) when clearly they are not bond fide emails.   I have configured SMTP servers and mail server rules in the past in my job so I know it is possible to filter outbound emails on certain rules.  Why does TPG allow this to happen?   Now we can't send proper emails because the Mail server is blocking our address completely.  This is stupid and I would like to know whether we can be refunded for this service now that we can't use it?   I am well aware fo security requirements for scanning computers and other devices for malware.  None of my devices is recording a virus or malware.    I can't find a way to contact TPG about Mail issues - all contact numbers are for ADSL or NBN issues only.  This is a completely different problem that your usual help desk will not be able to answer.     Please don't give me standard responses - this is a server configuration problem which is allowing the mail account to be abused.      ... View more