Symptoms
You find that messages to Yahoo are not arriving at the destination email address. Additionally, you find errors in /var/logs/exim_mainlog that are similar to the following:
CONFIG_TEXT: Messages from 203.0.113.2 temporarily deferred due to unexpected volume or user complaints
Cause
This typically happens after your server has sent out a large volume of spam messages.
Resolution
You must locate the source of the spam messages and prevent them from being sent. These are useful guides for locating spam issues:
How to find the source of spam emails
Using cPanel's Mail Status Probe script to diagnose spam related issues
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