I would 1) report it to Github, 2) flag it as spam in your web mail client, 3) report it as spam to whatever mailing service the company may be using (Sendgrid,

I would 1) report it to Github, 2) flag it as spam in your web mail client, 3) report it as spam to whatever mailing service the company may be using (Sendgrid, Mailchimp, whatever).