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I appreciate that they allow you to submit it nonetheless. I was expecting to get blocked. My hyphenated address with a .me TLD seems to break a lot of signup forms, and many of them won't let me submit the form with a valid address.

hey milliams, we recently had a spam attack so we implemented sendgrids email validation but made it non-blocking

https://sendgrid.com/solutions/email-api/email-address-valid...

sendgrid is still not aware of hey.com .

yikes

There's an even a freer alternative, not FOSS though.

http://zcal.co

It also allows connection to multiple calendars.