There are a lot sent along with an email besides the To/From names. The name is pretty easy to spoof, but the SMTP request and timestamps is much harder. Also m

There are a lot sent along with an email besides the To/From names. The name is pretty easy to spoof, but the SMTP request and timestamps is much harder. Also most reputable senders now use SPF, a type of DNS record, to verify email servers. But email usually trusts by default, unless your servers are very locked down. You can still send 'unverified' email, but its easier to trip spam filters if you send too much.