Message with suspicious header

Hi,

I received an automatic email from the list saying that my message is being held due to suspicious header. I am still waiting for moderation but I would like to know why it was classified as suspicious so I don't make the same mistake next time, is there a way to verify this?

I used git send-email to send it.

The message subject: Re: [PATCH v2 RFC] nvme: improve performance for virtual NVMe devices
The message id: :
<1462287456-4170-1-git-send-email-helen[dot]koike[at]collabora.co.uk>

Thank you

Helen