I'd assume you are using the MAP command to send email per each event from your base search, since I found that you can simply use the sendemail command in your main search without using MAP command. I found the following SPL works when using MAP with sendemail inside. ... your base search ...
| table emailaddress ...
| map search="|makeresults |sendemail to="$emailaddress$" from="
[email protected]" incline=true sendresults=true subject=mysubject message=mymessage"
... View more