You are welcome to reach me by email, but please include as much details as possible (about company, team, org, role, comp etc) - so I can decide whether to engage.
If I didn't reply that means I'm not interested at this time or your email doesn't have enough info for me to decide either way. Please do not try to send me "follow up" emails that don't contain any new/useful information. Those emails are useless to both you and me - I will mark them as SPAM so that you will never be able to reach me by email again.
I prefer to exchange info by email as much as possible and not schedule calls until absolutely necessary.