Suddenly, I cannot send email to my work address from my home address...neither can anyone else who is using the same ISP (Knology.net)
Here is the error I am getting:
This is the mail system at host amavis-outgoing1.knology.net.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
<firstname.lastname@example.org>: host mx1234.carrierzone.com[18.104.22.168] said:
550 5.7.1 <email@example.com>... Relaying denied: You must check
for new mail before sending mail. (in reply to RCPT TO command)