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It does work, but there might have been queued emails in your mail server from earlier. Some mail servers won't deliver hundreds of emails to the same address all at once; they will rate-limit them. So even though no new emails are generated, the old ones are still being sent.

Alternatively, you may be receiving email for other block reasons. Check what the email says.

Ideally, you need to disable those emails altogether. These are only meant for two use cases: 1. you are doing the initial set up of Admin Tools on your site and you need to unblock yourself as you're working through it; and 2. you are trying to troubleshoot something. In regular operating conditions you are meant to disable those emails.

I am sorry, but I cannot reproduce your issue with the Admin Tools, Joomla, and PHP version you specified.

I have tried triggering 404Shield and I am getting the expected results depending on whether the offender's IP is in the "Never block these IPs" list, and whether 404Shield is added to the "Do not send email notifications for these reasons" field:

• IP is added (regardless of do not email for the reasons): nothing is logged, no email is generated. Expected, because you have told Admin Tools to not block this IP. Therefore, nothing is logged for this IP. As a result, no email is generated (since emails are a result of logging a blocked request).
• IP not added, 404Shield added: you DO NOT get an email, but a blocked request IS logged. This is expected, as you told Admin Tools to not email you about this kind of blocked request.
• IP not added, 404Shield not added: you DO get an email, and a blocked request IS logged. This is expected; it's the default behaviour.

The only thing I can possibly think you might be doing wrong is getting an email from a different site, or an older version of this site on a previous host. In any case, there is no bug in our code, therefore I can't be of any more help.

Oh, now I understand what you mean.

The "Do not send email notifications for these reasons" only applies to "Email this address on blocked request". It DOES NOT apply to "Email this address after an automatic IP ban".

If you put your email address in "Email this address after an automatic IP ban" you will receive an email for every IP address that gets blocked regardless of what was the reason of its last blocked request which triggered the ban. 

Do remember that the IP auto-ban feature works against all blocked requests. The reason you see is the reason of the last blocked request. It does not mean that this IP address only got requests blocked for this reason, nor does it mean that we process blocked requests per reason.