SuperTokens is an open source authentication solution offering features like: Different types of login: Email / password, Passwordless (OTP or Magic link based).

SuperTokens.com

Hi, I'm using sendgrid to send mails with OTP and magic link. So sometimes user don't receive mails. So in that case I want to use default supertokens mailing system as a callback to this issue. Is that possible ?

hey <@727566648931909687> - how do you know if a user has not received the email? Do you assume thats the case if they click on the resend button?

no we get a response code with 400 or 500 error. So based on that we want a fallback aproach

right. So in that case, you can just call the original implementation of sendEmail and that should fallback on the default method

this is assuming that the call to sendgrid and it returning the status is synchronous.

yeah its synchronous. So I have a custom body to be send. how can override that ?

So for that, you need to use the smtp service we have and configure your smtp settings + define your custom body in there. Then calling the original implementation will use the smtp service.

if you want to fallback on us sending the email, then you can't customise the template.

This is how I'm sending the mail currently.

If you see 

`sgMail
 .send(msg)
 .then(([response, body]) => {
          console.log('Email sent successfully.');
           console.log(response.statusCode);
 })
 .catch((error) => {
         console.error(error)
})`

If the `response.statusCode` is 400 or 500 related then I want the mail to be send from supertokens.

Then do `originalImplementation.sendEmail(input)`

Ok, but you are saying we cant provide custome body then ?

yea. If you want us to send the email, no custom body

if you use the smtp service (see docs), then you can