Hello DMehaffy,
I have the same issue using strapi version:4.12.1 with mysql.
smtp is configured using @strapi/provider-email-nodemailer:4.12.5.
The test emails are working fine and I also added response and shipper email. abc@mydomain.com for both shipper and response email and Setttings > Advanced Settings > “Enable email confirmation” is also turned on.
this is my package.json
"@strapi/provider-email-nodemailer": "^4.12.5",
"@strapi/strapi": "4.12.1",
"mysql": "2.18.1",
"nodemailer": "^6.9.4"
But after creating new user I’m not receiving any email. Pl help I’m stuck in this