@drodman29 As mentioned by everyone, The action.email.domain_allowlist setting in alert_actions.conf performs a strict, literal string match against the domain part of the email address. It does not natively support wildcards like *.mydomain.com So, when you set action.email.domain_allowlist = *.mydomain.com, Splunk is literally looking for an email address like user@*.mydomain.com, which is not a valid email domain format and thus won't match a@temp.mydomain.com or b@perm.mydomain.com So i believe possible workaround you can do is Scripted Alert Action options. Instead of using the built-in sendemail alert action directly from the Splunk UI for these specific alerts, you configure the alert to trigger a custom script. Regards, Prewin Splunk Enthusiast | Always happy to help! If this answer helped you, please consider marking it as the solution or giving a kudos/Karma. Thanks!
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