IT Answers » Email authentication http://itknowledgeexchange.techtarget.com/itanswers Wed, 19 Jun 2013 12:11:00 +0000 en-US hourly 1 Email Security – Verify Sender http://itknowledgeexchange.techtarget.com/itanswers/email-security-verify-sender/ http://itknowledgeexchange.techtarget.com/itanswers/email-security-verify-sender/#comments Sun, 01 Mar 2009 13:07:51 +0000 Maryam82 An email was sent to some of our users and the sender appears to be one of our company’s users and he didn’t send it because it shows on our gateway filter. Emails between our company’s users are handled by exchange itself.
After checking the filter gateway the message ID = ….@filter.gateway.com
And accepted from unknown IP 69.20.5.219
Reverse DNS lookup is enable on filter gateway …
How can we prevent this from happening again?
Not to accept emails with our users emails in from field unless it was originated from the user himself.

]]> http://itknowledgeexchange.techtarget.com/itanswers/email-security-verify-sender/feed/ 0 I need help with Exchange 2003 Authentication through Telnet http://itknowledgeexchange.techtarget.com/itanswers/i-need-help-with-exchange-2003-authentication-through-telnet/ http://itknowledgeexchange.techtarget.com/itanswers/i-need-help-with-exchange-2003-authentication-through-telnet/#comments Thu, 18 Dec 2008 19:16:25 +0000 Ironhide I’m having trouble getting email to authenticate correctly using Telnet. I can get email using Outlook, OWA, and Sync is working too for mobile phones. The company is going to integrate Unified Messaging using a NEC product. The NEC product needs to be able to login through telnet. When I telnet to the exchange server to make sure that the account I setup for the UC is working correctly. I get the below read out from telnet. I tried other user accounts too and the same issues arise.

220 servername Microsoft ESMTP MAIL Service, Version: 6.0.3790.3959 ready at
Thu, 18 Dec 2008 13:22:41 -0500
ehlo
250-servername Hello [192.168.168.101]
250-TURN
250-SIZE
250-ETRN
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-8bitmime
250-BINARYMIME
250-CHUNKING
250-VRFY
250-X-EXPS GSSAPI NTLM
250-AUTH GSSAPI NTLM
250-X-LINK2STATE
250-XEXCH50
250 OK
mail from: user@domain.com
454 5.7.3 Client does not have permission to submit mail to this server.

Connection to host lost.

Press any key to continue…

]]> http://itknowledgeexchange.techtarget.com/itanswers/i-need-help-with-exchange-2003-authentication-through-telnet/feed/ 0 EPPI Card scam using my email. How do I stop it? http://itknowledgeexchange.techtarget.com/itanswers/eppi-card-scam-using-my-email-how-do-i-stop-it/ http://itknowledgeexchange.techtarget.com/itanswers/eppi-card-scam-using-my-email-how-do-i-stop-it/#comments Sat, 31 May 2008 12:40:04 +0000 The kadels I recieved three mailer daemon emails about more than 30 emails that I never sent. It said that I tried to send emails about EPPI card. There is nothing in my sent box. How do I figure out where this is coming from and stop it?

]]> http://itknowledgeexchange.techtarget.com/itanswers/eppi-card-scam-using-my-email-how-do-i-stop-it/feed/ 0