Is this a scam?

Don’t know whether this is a scam but I’ve just received an email asking if I did custom orders and to reply to sullivansamuel1@yandex.con
I replied and it said the email had been rejected and there were 2 attachments on the rejection email, which I haven’t opened.
It just seems a bit dodgy to me, so I thought I would just warn everybody in case it is a scam.

I received the same email Martine about an hour ago regarding custom orders. The email address had the same name but the extension was @yandex.ru which is Russian. I just deleted the email, as I’m almost certain it’s a scam

I received the same email with the same details this afternoon. My return email got returned by my server too. It didn’t feel right and I have just deleted it.

Thought it looked dodgy