220 old.null.cz ESMTP Postfix
ehlo dev.null.cz
250-old.null.cz
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
mail from: <dev@null.cz>
250 2.1.0 Ok
rcpt to: <"-test@old.null.cz">
501 5.1.3 Bad recipient address syntax
rcpt to: "<-test@old.null.cz>"
501 5.1.3 Bad recipient address syntax
rcpt to: <'-test@old.null.cz'>
501 5.1.3 Bad recipient address syntax
rcpt to: <'-test'@old.null.cz>
550 5.1.1 <'-test'@old.null.cz>: Recipient address rejected: User unknown in local recipient table
rcpt to: <"-test"@old.null.cz>
501 5.1.3 Bad recipient address syntax