the last two days I have users say they reply to emails that originated outside our org and they receive NDR's that read: None of your e-mail accounts could send to this recipient on the properties of the email address, changing the Email Type from MAILTO to SMTP works. but we shouldnt have to do that. we are using Outlook 2007SP2 and Exch 2007 sp1 rollup 9. any help would be greatly appreciated.

Hi route6668, Could you post more information? You change the type of which e-mail (internal or external)? This is the only recipient that have this problem? Regards Rafael Okamoto

a couple of users have this problem. not sure what you need me to post.

Hi, Please check the following thread which discussed a similar issue. http://social.technet.microsoft.com/Forums/en-US/exchangesvradmin/thread/56b2d50d-6855-444b-abed-89aaa9176a9f Please also try to clear the email address cache for outlook: 1. Open C:\Users\YourUserName\AppData\Roaming\Microsoft\Outlook, copy the outlook.nk2 file to another folder as a backup. If you are using Windows XP or 2003, please go to the following folder: C:\Documents and Settings\"youruser"\Datos de programa\Microsoft\Outlook 2. Click on the File menu –> Options –> Mail 3. Scroll down to Send messages section and click on the Empty Auto-Complete list button to clear or empty the auto complete name suggestion list. Then test to see if the issue persists.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Thanks Gen Lin-MSFT

indeed - we have that patch installed. any info on a fix from MS?

Hi, Does the issue persist after clearing the email address cache for outlook: ========================== 1. Open C:\Users\YourUserName\AppData\Roaming\Microsoft\Outlook, copy the outlook.nk2 file to another folder as a backup. If you are using Windows XP or 2003, please go to the following folder: C:\Documents and Settings\"youruser"\Datos de programa\Microsoft\Outlook 2. Click on the File menu –> Options –> Mail 3. Scroll down to Send messages section and click on the Empty Auto-Complete list button to clear or empty the auto complete name suggestion list. Then test to see if the issue persists. Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Thanks Gen Lin-MSFT

Just started seeing the same issue and after reading the similar thread http://social.technet.microsoft.com/Forums/en-US/exchangesvradmin/thread/56b2d50d-6855-444b-abed-89aaa9176a9f tried simply deleting the offending address(es) from the auto-complete cache (start typing it in the TO: line until it appears and then hit "delete" key) and having the user hand type the address(es) into a new email the problem went away. looks to me like the original mailto: link that the user clicked on was malformed, basically just bad HTML, it was displayed as mailto:addressATdomain.com and underlined with another mailto: hyperlink/tag thus producing a double mailto: tag which Outlook didn't understand and therefore reject before even handing it off to Exchange. MCITP:Enterprise Admin MCSA, MCSE, MCDBA