N300 advice from multiple email address?

I get emails suggesting I need to update the firmware from two different emails:

1. netgearsecurity@e.netgear.com  in June 2017

2. emarketing@e.netgear.com  in October 2017

and I am told in the email to add security@e.netgear.com to my accepted email list.

Are all three email accounts from Netgear and not some phishing scam?

Sam