Question : Error 550 5.7.1. Relaying denied. Proper authentication require

Hi,

We are using Centos 4.6 with Sendmail (version 8.13.1, config V10/Berkeley). recently we added a new domain "zoharashalev.com" and the customers reported that emails that he send via outlook are rejected,  we tested it with a yhaoo mail box and here is the log:

Mar 10 09:57:47 fastweb2 sendmail[22855]: m2A7vinN022855: from=m>, size=0, class=0, nrcpts=0, proto=ESMTP, daemon=Daemon0, relay=89-139-198-228.bb.netvision.net.il [89.139.198.228]

Mar 10 09:57:44 fastweb2 sendmail[22855]: m2A7vinN022855: ruleset=check_rcpt, arg1=>, relay=89-139-198-228.bb.netvision.net.il [89.139.198.228], reject=550 5.7.1 ... Relaying denied. Proper authentication required.

Please help with this.

Thanks,
Amir

Answer : Error 550 5.7.1. Relaying denied. Proper authentication require

How to setup an E-Mail Relay Host with Sendmail:
http://www.akadia.com/services/sendmail_relay.html