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Message: [QUOTE="Ruth, post: 4720970"] Hi We have been sending email to a distribution list for over a year now and just yesterday we recieved an error message for some on the list and the email addresses are still valid: The format of the recipient's e-mail address isn't valid. A valid address looks like this: [email]username@contoso.com[/email]. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try sending the message again, or provide the following diagnostic text to your system administrator. _____ Sent by Microsoft Exchange Server 2007 Diagnostic information for administrators: Generating server: llt-exch1.LowerLakes.local mailto:marcg@mts.net #550 5.1.3 STOREDRV.Submit; invalid recipient address #SMTP# Original message headers: Received: from llt-exch1.LowerLakes.local ([192.168.0.7]) by llt-exch1.LowerLakes.local ([192.168.0.7]) with mapi; Tue, 27 Apr 2010 09:04:51 -0400 MIME-Version: 1.0 Content-Type: text/plain Date: Tue, 27 Apr 2010 09:04:51 -0400 Message-ID: <5AA068DEF7032141876432D51C289C2B2A007333D9@llt-exch1.LowerLakes.local> Subject: RE: morning message not recieved 5.1.3 STOREDRV.Submit; invalid recipient address #SMTP# How do you fix this? [/QUOTE]