Connecting to 37.120.175.**
220 v22015071977******.yourvserver.net ESMTP Postfix (Debian/GNU) [719 ms]
EHLO PWS3.mxtoolbox.com
250-v22015071977******.yourvserver.net
250-PIPELINING
250-SIZE 10240000
250-ETRN
250-STARTTLS
250-AUTH DIGEST-MD5 CRAM-MD5 PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN [734 ms]
MAIL FROM:<supertool@mxtoolbox.com>
250 2.1.0 Ok [750 ms]
RCPT TO:<test@example.com>
454 4.7.1 <test@example.com>: Relay access denied [734 ms]