outlook 2003 & 2007 Tags: Windows 7 Outlook 2003 Last response: May 20, 2013 12:55 PM in Windows 7 Share Yamaguchi May 20, 2013 12:26:15 PM guys while I am the only person in my household with this error code, I would truly appreciate an easy solution to outlooks error code 550. Anyone with info pls respond. Thanks in advance..... Sorry for my lame request guys, here is one of the thousands of responses that I receive as if I were initiating messages to these persons: [Return Code 550] sid: doxT1l0091NDzRC01 :: 5.1.1 unknown or illegal alias: email@example.com More about : outlook 2003 2007 noidea_77 a b $ Windows 7 May 20, 2013 12:36:42 PM Because your description is very unspecific and you don't even mention, when the error occurs, i recommend searching for "outlook error code 550" on google. There are a lot of hits and one may be related to your problem. m 0 l ex_bubblehead a b $ Windows 7 May 20, 2013 12:55:37 PM Start here: http://office.microsoft.com/en-us/outlook-help/troubles... Then do a complete malware/virus scan of your PC as it may have become part of a botnet. m 0 l Can't find your answer ? Ask ! Publish Related resources lock microsoft outlook 2003/2007 add email account? Forum SolvedMoving contact list from Outlook 2007 to Outlook 2010 Forum SolvedOutlook 2007 Duplicating Emails Forum SolvedUnderline Not Working in Outlook 2007 Forum Solvedoutlook 2007 will not open Forum SolvedCan't attach files in Outlook 2007 Forum SolvedCan't attach files in Outlook 2007 Forum Solvedoutlook 2003 is sending e-mail displaying a different e-mail address Forum SolvedOutlook 2003 corrupted in Windows XP Forum Outlook 2007 Sending Receiving Error Forum SolvedMigrating Outlook 2007 to 2010 Forum SolvedOutlook 2003 sends mail but cannot receive mail Forum Solvedoffice outlook 2003 problem --Followup Forum SolvedOutlook 2003/XP E-Mails To Wrong Folders Forum SolvedOutlook 2003 SP3 takes 15-25 seconds to open Forum Autoarchiving Outlook 2007 ? Forum Ati sapphire readon x1950 with a oldschool 2003-2007 gaming computer and a gateway EX-500S Forum Outlook 2007 - Can't attach files or save attachments to my documents folder Forum I can't change the default browser in outlook 2007 Forum SolvedOutlook 2003 works intermittently on Windows 7 Forum More resources Read discussions in other Windows 7 categories Configuration Customization Drivers Security Laptops !