mail relay checking

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http://www.linuxquestions.org – Hi , I need a command like testing to verify my mail setup . I have a linux box lclient1, in which the send-mail client is configure to use the smtp.mymail.com to relay . Though i can read the mail headers to confirm the mail generated by any user from lclient1 uses smtp.mymail.com , Is there a way to run a command on the client lclient1 to check it uses to relay the server smtp.mymail.com . Thanks (HowTos)