Hi @tam1,
Welcome to the Auth0 Community!
I understand that you have questions about configuring your Custom SMTP Email Provider, specifically with password reset emails.
From what I understand, I believe you will need to adjust your authenticated domain in Sendgrid to use your preferred email address. This value cannot be altered in Auth0. Once that is complete, I believe you can send the password reset emails without problems.
Please let me know how this works for you.
Thank you.