Manual SMTP Relay Test

S: 220 mail.test.com ESMTP Postfix
C: EHLO test.com
S: 250-mail.test.com
S: 250-PIPELINING
S: 250-SIZE 10240000
S: 250-VRFY
S: 250-ETRN
S: 250-XVERP
S: 250 8BITMIME
C: mail from:<user@domain.com>
S: 250 Ok
C: rcpt to:<howto@domain.com>
S: 250 Ok
C: data
S: 354 End data with <CR><LF>.<CR><LF>
C: Testmail relaying mail from user@domain.com to howto@domain.com
C: Test #3
C: .
S: 250 Ok: queued as 84BA64078A
C: quit
S: 221 Bye

Legend:

S: = server

C: = client