I have recently been informed that a couple of customers have been getting a error message whilst attempting to send an email via the usermin interface. The errors says something along the lines of can't send email as you have exceeded your quota (We have the Mail Rate Limiting set on the server) But it appears we are not having the issue with exceeding quotas with customers using mail clients to send mail even on the same domain. So it seems localised just to usermin.
Can you please let me know if you are aware of this type of issue, if not then I will attempt to provide better information to assist.
Please note we are also using authentic theme.