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This is simple but it is very useful procedure to test email functionality.
First connect to your server using telnet
telnet xx.yy.zz.pp 25 Connected to xx.yy.zz.pp. Escape character is '^]'. 220 xx.yy.zz.pp ESMTP
Initialize communication Enter following line.
EHLO xyz.com
will return like below
250-xx.yy.zz.pp 250-PIPELINING 250-8BITMIME 250-SIZE 0 250 AUTH LOGIN PLAIN CRAM-MD5