Event Espresso uses the wp_mail() function to send mail. Meaning if your WordPress install can not send mail neither can Event Espresso. Are you able to receive emails from other plugins or from WordPress?
I would start by checking your install can send mail using a plugin such as WP Check Email.
Thanks for the quick reply, now I have it working smoothly.
Thank you guys.
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Support forum for Event Espresso 3 and Event Espresso 4.