Newly Added Alias in exchange 2007 users mail addresses rejects incoming mail.

Senders get failed delivery notification right away.
Reason: Remote SMTP server has rejected address
diagnostic code: smtp;550 5.7.1 unable to deliver to .....

Existing alias' work fine. only adding new are an issue.

Thank you
wlasnerDirector, ITAsked:
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Peter HutchisonSenior Network Systems SpecialistCommented:
Did you add the new domain to the Accepted Domains list in Exchange (see Organisation config)?
wlasnerDirector, ITAuthor Commented:
Not sure what you are referring to by new domain. my email is In exchange management, I added and alias of to my smtp addresses to any mail sent to that alias would come to my real email account. I have several others that work fine internally and externally. The one I just added works internally but senders from the outside get rejection errors above.

Kini pradeepDevelopment ManagerCommented:
a few quick questions,

1. are you using an Exchange edge transport server
2. or a Third party mail filter appliance / service - is this alias created there ?
3. what is the system policy for email addresses in your org ?

5.7.1      A very common Exchange 2010 NDR, the cause is a permissions problem.  For some reason the sender is not allowed to email this account.
       Perhaps an anonymous user is trying to send mail to a distribution list.
       Alternatively, a user may have a manually created email address that does not match a System Policy.
       Check SMTP Virtual Server Access Tab.  Try checking this box: Allow computers which successfully authenticate to relay.
       Check the outgoing SMTP logs.
       Check: Mailbox – <Mailboxname> – Properties – Mail Flow Settings – Message delivery restrictions.
       Try disabling Windows-Integrated-Security.  Instead allow only standard authorization on the SMTP receiver on the Exchange 2010 server.
       Check Attachment filtering on the Edge server.

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wlasnerDirector, ITAuthor Commented:
1. no
2. yes SW ESA 3300, no alias needed to be created
3.not sure there is one

we are on exchange server 2007 not 2010

cannot find smtp virtual server tab or the integrated security options.
wlasnerDirector, ITAuthor Commented:
Thank you for attempting to help with this issue. We have decided to upgrade our server to 2013 anticipating resolution tho this and other issues.
wlasnerDirector, ITAuthor Commented:
Good information but no resolution at this time
thanks for the effort.....
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