We were hosting our servers on Godaddy and were using Godaddy SMTP relay service for sending alert emails and reports. Today we received the following message:
YOU HAVE REACHED YOUR DAILY SMTP RELAY LIMIT
Your hosting server will be unable to send an email until the daily SMTP relay limit is reset. The daily SMTP relay limit is reset on all accounts at midnight MST.
Although we use different providers, this is the first time we saw such a message. We sent a request to the organization 12 hours ago and have heard no reply yet.
We are very sorry, but today some emails will be delivered later than expected until the limit is reset. I hope our customers also use IM and SMS as alternative channels. BTW we just enabled our users to buy extra SMS as needed – pure coincidence – and actually reach the limit because were sending announcement emails.