Go-Mail multiple recipients and attachment

I am trying to make an email service using go-mail library and made it working. However there are few challenges that i am unable to solve

I have the struct for form data-

type SendMailBody struct {
	EmailTo []string `form:"sendTo"`
	Subject string   `form:"subject"`
	Body    string   `form:"body"`
}

The form data that i am sending to the API is

subject: Notification
sendTo:["abc@gmail.com", "xyz@gmail.com"]
body:You have been notified

Challenges-

1. If I pass a single email in "sendTO", It is working fine. But after passing the slice of emails, it is unable to send emails to the recepients. How can i make it work?

2. If I pass the attachment through Form data, how can I attach it with the mail. In documentation, it is mentioned that we can do it like that "m.Attach("/tmp/image.jpg")" . But how should i do it if i pass the attachment via form data in API

Please guide me through that.

Some more details are needed to help here. In particular which go-mail are you using?

For 1.)

If you refer to https://github.com/wneessen/go-mail, using Msg.To() should work fine with multiple recipient. See the documentation at: https://pkg.go.dev/github.com/wneessen/go-mail#Msg.To

If you refer to https://github.com/go-mail/mail, there is Message.SetAddressHeader() (https://pkg.go.dev/github.com/go-mail/mail?utm_source=godoc#Message.SetAddressHeader) which does not support multiple recipient addresses. You would need to use Message.SetHeaders() for the "To"-header instead (https://pkg.go.dev/github.com/go-mail/mail?utm_source=godoc#Message.SetHeaders).

For 2.)

This totally depends on how you read the attachment data (and again also on the go-mail library you are using). https://github.com/wneessen/go-mail has different ways of attaching and embedding files (i. e. from a local file, from embedFS, from an io.Reader...)