Hello, I finally managed to configure my mail server at home on my gateway with sendmail/qpopper. I am able to receive my mail from default root(root@snoopy) account to any of my other local accounts(e.g Sundar@eSaravana.com). But when I try to send mail from any of my local accounts(Sundar@eSaravana.com) to itself(Sundar@eSaravana.com) -- I have just created only one account -- I get following error message Sending failed: a SMTP error occurred. Command: MAIL. Response: 501 5.1.8 <sundar@eSaravana.com>.. Domain of sender address sundar@esaravanana.com exist. My local DNS server runs on another machine and the domain is --esaravana.com And my sendmail configuration is as follows snoopy:~ # sendmail -d0.1 Version 8.11.2 Compiled with: LDAPMAP MAP_REGEX LOG MATCHGECOS MIME7TO8 MIME8TO7 NAMED_BIND NETINET NETINET6 NETUNIX NEWDB NIS NISPLUS QUEUE SCANF SMTP TCPWRAPPERS USERDB ============ SYSTEM IDENTITY (after readcf) ============ (short domain name) $w = snoopy (canonical domain name) $j = snoopy.esaravana.com (subdomain name) $m = esaravana.com (node name) $k = snoopy ======================================================== Recipient names must be specified Any help! Sundar