Spoof your email and land in inbox!
First get an good smtp, I recommend Mailgun. Get a cpanel or have a domain so you can verify your domain there and get your smtp credentials. Also mailgun allows spoofing !. They also got a free 50k starter trial, But you will need a debit card to do this, I recommend just using a dead gift card or whatever. Anything that is live works, You dont need to verify with 3D. Make sure when you send your emails you send with a 5 second delay to not get banned to quick.
Then once you got your smtp credentials this is where the spoofing comes in play. The from email you write on your email sending software can be anything basically. You can write the from mail as info@booklng.com, But notice what i did there i wrote booklng instead of booking. Some domains have protection against spoofing called spf and dmark. So you have to be creative with this and play around.
I have an email sending software on me . It works perfectly for mass sending in bulk, You Can pm if you want to buy
Enjoy!