hi guys, when a employee in our company tries to send an e-mail to a specific adres she gets the following error message op 9-9-2009 11:59 "e-mail adres" date and time there is a smtp communication error at the e-mail server of the adressed one, please contact your system engineer <"domain"#5.5.0 smtp;550 Administrative prohibition> Hopefully you can help me, i can't find the solution to this problem on the internet. Thanks

Is this issue happening with a specific domain or is it happening with any domain that you send mails to.. Telnet to (problematic domain.com 25) from your exchange server. Follow this KB article for telnet steps. http://support.microsoft.com/default.aspx?scid=kb;en-us;153119 2. If you get a Administrative Prohibition on giving the command "rcpt to:" 3. It seems that this domain that is domain.com is been blocked or restricted on any spam filter on the other domain. 4. Check out with the Administrator of the Other Domain. Vinod |CCNA|MCSE 2003 +Messaging|MCTS|ITIL V3|

Hi,The error message 550 Administrative prohibitionmostly refers that the IP from which your mail server sending mails is in any of the RBL's (Real-time Black Lists).Cross check the SMTP Public Domain, and MX record status, if any issue resolve this on priority.Please use these sites to know are you in any of the RBL'sNote: Make sure your MX record is having a PTR record associated and a SPF record.http://whatismyipaddress.com/staticpages/index.php/is-my-ip-address-blacklisted?gclid=CJvppfiR8ZwCFQkIswodRB0zlAhttp://www.mxtoolbox.com/blacklists.aspxhttp://www.dnsbl.info/