well intresting because we tried this zepto email on our server and we get these errors which is stopping the emails from being sent. Because we are using wp_mail() function from evo_helper() class
these are the errors perhaps you can share these errors with the email plugin developers and they can provide some insight. because using wp_mail() with out this plugin emails go fine for notifications.

Could you try disabling WP Rocket plugin and check?
Hello,
Please follow this guide:
https://docs.myeventon.com/documentations/how-to-add-additional-fields-to-download-attendees-csv-file/
Hello,
Could you elaborate? Not sure what you are referring to.
Ashan,
I don’t remember if RSS Feed showed start and end dates before. On dev2:
https://dev2.myeventon.com/evofeeds
Hello,
Thank you for your messages, I am going to assign this ticket to Ashan and he will be able to take it from here and find you a solution. Please allow some time for him to get back to you, we greatly appreciate your patience and thank you for being a eventon customer! Also please disable any IP blocking on your site if there are any.
Hello,
Please take a look at FullCal add-on:
https://www.myeventon.com/addons/full-cal/
Try it on https://dev.myeventon.com/wp-admin/
Please add this CSS code to EventON > Styles (If you don’t see any change, EventON > Scripts & Styling > turn off Write dynamic styles to header > save settings > turn on Write dynamic styles to header).
We are glad your issue is resolved, if you have any further questions or concerns please create a new ticket.
If you have a moment, we would greatly appreciate if you could kindly leave us a review at codecanyon! from your account > downloads. Cheers!
Hello,
Please go to wp-content/plugins/EventON/css/eventon_styles.css and find border-radius. Comment or remove all of them. Make sure to clear your browser cache.