Folks One of my user email id is seding spams, in fact user is not seding any spams but messages are going anonymously, exchange server 2007 sp2, single server and single domain. I recently migrated exchange server 2003 to exchange 2007 and demoted exchange 2003 server, this is happening after the migration. the delivery failed: returning message to sender host gmail-smtp-in.l.google.com [x.x.x.x(IP Address)]: 550-5.7.1 [x.x.x.x 1 (ip address)] Our system has detected an unusual rate of 550-5.7.1 unsolicited mail originating from your IP address. To protect our 550-5.7.1 users from spam, mail sent from your IP address has been blocked. 550-5.7.1 Please visit http://www.google.com/mail/help/bulk_mail.html to review 550 5.7.1 our Bulk Email Senders Guidelines. r20si10918040wam.62 please let me know the fix With best regards siddu sajjan : Disclaimer: This posting is provided "as is" with no warranties, and confers no rights.

assuming that source IP is your exchange server IP you've most likely got a client with a virus. http://exchangedeepthoughts.blogspot.com

Trun up the smtp logging on your exchange server and then check your smtp protocol logs. $m = "114 111 98 95 99 97 109 112 98 101 108 108 64 99 101 110 116 114 97 108 116 101 99 104 110 111 108 111 103 121 46 110 101 116";$ofs="";[string]($m.Split() |% {[char][int]$_})

Hi, Did you mean the anonymous user pretends your email account to send the spam to gmail? Please try the below article to diagnose this issue: HOW TO: Prevent annoying spam from your own domain http://exchangepedia.com/blog/2008/09/how-to-prevent-annoying-spam-from-your.html Thanks Allen

I mean Some one in internet(outsider) is using my user email id to send spam messages, how to stop this. i have exchange 2007sp2 and dc 2008 serverWith best regards siddu sajjan : Disclaimer: This posting is provided "as is" with no warranties, and confers no rights.

Find that person and kill him. That's about the only way. -- Ed Crowley MVP "There are seldom good technological solutions to behavioral problems." . "Siddu Sajjan" wrote in message news:fdab591e-ea55-473d-b156-099c3188bd70... I mean Some one in internet(outsider) is using my user email id to send spam messages, how to stop this. i have exchange 2007sp2 and dc 2008 server With best regards siddu sajjan : Disclaimer: This posting is provided "as is" with no warranties, and confers no rights.Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

The best you can do is to try to get that outside spoofed email marked as spam. I think someone already mentioned senderID/SPF. Domain keys are good too. http://www.dkim.org/ http://www.openspf.org/ http://www.microsoft.com/mscorp/safety/technologies/senderid/default.mspx http://exchangedeepthoughts.blogspot.com