Does a kernel developer need a hardware to do kernel development?

Hi, (1) I want to work on staging drivers. But I've two questions, Does a kernel developer need a hardware (e.g. board) to do kernel development? (2) I'm able to send patch using sendmail and git. I'm able to apply patch using git-am. But unable to setup mutt to download patch from this emailid. How to setup mutt to download patches? -- Regards, Amit Kumar Twitter: @freeark1 Only Numbers Can Command.