Early on Tuesday, Sept. 5, a compromised website on our shared hosting server began sending out high levels of spam which caused that server to be temporarily listed on e-mail spam blacklists. The compromised website has been re-secured and we are in the process of removing the server from the blacklists. In the meantime, outbound mail may be disrupted for customers with SierraEmail.com, SpiralEmail.com, or custom domain e-mails.
Symptoms include messages not arriving at their destination (due to being queued for later sending after the blacklisting resolves), or sent mail being returned with an error stating that the message could not be delivered.
We anticipate full service being restored by the morning of Wednesday, Sept. 6. In the meantime, failed e-mails can be resent from alternate addresses.
Our apologies for the inconvenience. If you have further concerns, please give us a call at (530) 478-9822, Ext. 1 for customer support.
Edit, 1:00 PM Sept. 6: The Spamhaus/CBL blacklisting which caused the most problems has been removed, which should address most spam-blocks by the end of the day.