Since one person has already asked, I'm using the TitanMint.com domain because it doesn't explicitly reference crypto currency.  I tried a half dozen email services using the *@titanbtc.com domains and they got shut down repeatedly. 

I previously used Mailchimp to communicate with Titan Mint customers.  All our existing email lists of customers and automations at mailchimp were also nuked because, from what I can tell, the crypto and NFT space is so rife with spammers that no email delivery service will now work with anyone affiliated with anything crypto.  If anyone has an email delivery service that still works with crypto companies, please let me know.