I have a PC and a Mac both of which I use to send and receive email. Recently, when I tried to send email via the Mac’s Mail system I received an ERROR message as follows: ‘This message could not be delivered. The reason for the failure is: Access Denied; your IP is listed by rbl-plus.mail-abuse.org‘. Can you please advise me how to remedy the problem?

The reason that you are receiving this bounce-back message is because you attempted to send an email message to a mail server which has chosen to reject emails sent from your IP address. However, don’t take this personally. Unless you have a permanent internet connection, your IP address will change each time you log onto the internet. This is known as dynamic IP addresses. Try logging off the internet, logging back on, and sending the email again. If you receive the same error message, then it seems your whole ISPs IP address range has been blocked on the particular server to which you are trying to send email. In this case, you cannot do much about this problem from your end of things, unless you send the email using a different ISP. Before considering this option, I suggest that you contact your ISP. For more information on the problem you are experiencing, have a look at mail-abuse.org/rbl/enduser.html.