Thanks, got it to work:
rule "send email when gif is ready - cam1"
when
Item CamFrontdoor_CreateGif changed from ON to OFF
then
logInfo("IP Cam frontdoor - GIF", "GIF ready and now sending email")
val mailActions = getActions("mail","mail:smtp:myemail")
mailActions.sendMail("myemail@mydomain.com", "Openhab IP-Cam frontdoor", "Openhab IP-Cam: ", "file:///tmpfs/camera/ipcamera.gif" )
end