To enable this feature, you need to have a change made to your domain name so that we can legitimately send email from your domain, otherwise your attendee emails will likely be seen as spam. You will need to instruct your IT manager, or the company that you purchased your domain name from, to add or amend the SPF record on your DNS.

NOTE: You should also make sure your IT department has an SPF record for SendGrid set up on the domain you want to send from. This will help stop emails going to junk in most cases. The information below may be helpful to your IT department:
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Example of SPF record: “v=spf1 include:eventsairmail.com -all"

Instructions for adding additional domain authentication in SendGrid can be found here: https://docs.sendgrid.com/ui/account-and-settings/how-to-set-up-domain-authentication#setup-steps-required-for-both-automatic-and-manual-setup