CODEWITHSUNDEEP
emailgosparkpostgomail
Brian Leishman
Brian Leishman

Reputation: 8565

How to set the "MAIL FROM" header for an email?

In the SparkPost (an email sending provider) documentation for setting "bounce domains" it says

specified in the [...] mail from header in the SMTP payload

https://www.sparkpost.com/docs/tech-resources/custom-bounce-domain/

But when I set the "MAIL FROM" header I get a response from their server stating

550 5.6.0 Invalid header found (see RFC2822 section 3.6)

I'm using the plugin gomail "gopkg.in/gomail.v2"

What does setting the "MAIL FROM" header actually mean? How do I set it?

Upvotes: 0

Views: 1656

Answers (2)

Benedikt Köppel
Benedikt Köppel

Reputation: 5119

In my case, I got the same error:

550 5.6.0 Invalid header found (see RFC2822 section 3.6)

After a bit of trial and error, I found that it was not an invalid header, but it was because the Subject: header was missing. Adding a subject solved the problem.

Upvotes: 0

Brian Leishman
Brian Leishman

Reputation: 8565

So it's not a header in the email, maybe their documentation says that incorrectly.

But it's one of the commands sent to the SMTP server when sending the email to the server. This is all handled in gomail, which uses the net/smtp package's Mail() function.

Instead of using 

return dialer.DialAndSend(m)

you can call the Send() function directly on the message, and pass to it a different address.

s, err := dialer.Dial()
if err != nil {
    return err
}
defer s.Close()

m := gomail.NewMessage()
mailFrom := "[email protected]"
to := []string{"[email protected]"}

return s.Send(mailFrom, to, m)

Upvotes: 0

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