Support

WordPress does not allow setting an alternate Mail Transfer Agent per email, unfortunately. This is something that you will only find in Joomla 4.

Admin Tools does let you, however, set up a different email recipient, limit the number of emails received, or even turn off emails for specific events or completely. 

Most of these options can be found in the Configure WAF page. Look under “Auto-ban” and “Logging & Reporting”. You can set up the recipient email addresses. No address means no email is sent. The “Do not send email notifications for these reasons” lets you select one or more request blocking reasons which will NOT generate an email if emails are otherwise enabled.

To set up mail limits, go to Web Application Firewall, Email Templates. Each template has a set of “Frequency limit” settings. The frequency limit is only applied when the “Enable security exception email throttling” in the Configure WAF page is set to Yes.

I recommend AGAINST receiving emails for blocked requests. Empty the “Email this address on security exceptions” field in Configure WAF. Admin Tools manages these request blocks and resulting automatic IP bans (temporary or permanent) automatically. That's the whole point. These emails are there mostly for troubleshooting reasons and only for people who can't be bothered logging into the site to peruse the Security Exceptions Log page in Admin Tools. 

Likewise, I think that the “Email this address after an automatic IP ban” feature is an overkill in production. It's only meant to be used when you are setting up Admin Tools; you will get very frequently blocked and the email contains a handy Rescue Mode URL to get yourself unblocked without having to mess around with renaming files over (S)FTP. When you move to production you should empty that field and let Admin Tools handle IP blocks for you.