Hi

i had configured sendmail but its delivering mail to gmail ,yahoo,Its not deliver .Its delivering the following error ,But im trying to send mail to my partiular domain name whether the user exists,but still its delivering error user status unknown

Feb 29 14:42:05s-desktop sendmail[14128]: q1T9C50V014128: to=<saravana@xxx.com>, ctladdr=ecare (1000/1000), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30091, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (q1T9C5Xd014129 Message accepted for delivery)
Feb 29 14:42:07 s-desktop sm-mta[14131]: STARTTLS=client, relay=xxxcom., version=TLSv1/SSLv3, verify=FAIL, cipher=AES256-SHA, bits=256/256
Feb 29 14:42:08 s-desktop sm-mta[14131]: q1T9C5Xd014129: to=<saravana@xxx.com>, ctladdr=<ecare@ecare.etl.com> (1000/1000), delay=00:00:03, xdelay=00:00:03, mailer=esmtp, pri=120345, relay=xxxcom. [204.93.168.132], dsn=5.1.1, stat=User unknown

The piece of information you sent does not indicate anything more than the email you are sending or receiving cannot be resolved as a valid user dsn:5.1.1 returned to the sender means a user that the email is addressed to does not exist.