Is HTML supported in subject line of email

Question

I'm sending emails, using Django framework.

And I wonder is it possible to make subject line red, using <span style="color:red">Some subject line</span>

Answer 1

No, HTML tags will not be rendered in the subject field of an email by RFC2822 compliant clients.

The RFC defines lexical tokens (HTML tags etc.) to be used in the body, not in the header fields. The subject is part of the header fields.

Note that this is not a limitation of Django.

If you want fanciness, you might want to look into including unicode characters, which is becoming more and more popular these days.