Have you tried my examples? If you can send email and you have access those internal logs then there are at least one log line. If you cannot see those then you haven't have access to those logs to see it. 2025-06-11 18:39:08,616 +0300 INFO sendemail:275 - Sending email. sid=1749656347.70143, subject="testing", encoded_subject="testing", results_link="None", recipients="['your.email@your.domain']", server="localhost" How you are sure that the issue is with splunk? Have you some logs which shows that e.g. alert is fired and it has try to send it via sendemail? For that reason I suggest 1st check that sending email is working and after that start to look why your alerts are not sending it. And quite often then the reason was that alert hasn't fired.
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