What email provider are you using? Please check spam folder. We're using same transactional email provider as Uber, Airbnb. I've pm you about the email detail, we will check logs.
I am using Zoho email provider. Isn't supported by your standards? If so, then you have to inform users in the sign-up page, as you have to mention the max of characters required to set a password.
Nothing in my spam folder.
I have sent you the email used for registration via forum pm.