# Sender verification SMTP (envelope and header) exim -bh 127.0.0.1 helo test mail from: rcpt to: rset mail from: rcpt to: rset mail from:<"unknown with spaces"@test.ex> rcpt to: rset mail from: rcpt to: data From: unknown@test.ex . mail from: rcpt to: data From: <> . mail from: rcpt to: rset mail from: rcpt to: data from: . quit **** # Sender verification (ESMTP) exim -bh 127.0.0.1 ehlo foo.bar mail from: rset ehlo foo.bar mail from:<"a b"@localhost2> rset ehlo foo.bar mail from:<"a b"@localhost3> SIZE=1234 rset ehlo foo.bar mail from:"a b"@localhost4 SIZE=1234 quit ****