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error sending out email from using Alias

I setup a user to send an email using her alias email, and it works fine internally, but when I try a test to send an email externally, I get this error message:

Server error: '550 5.7.1 Unable to relay'

Any ideas how to fix this?
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afacts
Asked:
afacts
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1 Solution
 
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Is Alias@YourDomain.com the Primary email address on the user properties ?

- Rancy
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afactsAuthor Commented:
No, it's not the primary.   The primary is user@domain.com
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afactsAuthor Commented:
I'm sure there's a setting somewhere on my exchange server that doesn't allow pop3 emails to relay, it's just strange, I thought it would be built in.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Ideally one can only send emails with Primary email of its own or anothers to send emails .... but receive on any that are assigned to him

- Rancy
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afactsAuthor Commented:
Well, then how come I send emails from the alias, but only internally, in my organization.
For example:
primary account is:  dan@domain.com
alias email is:  danalias@domain.com

So internally  I can send emails as danalias@domain.com, but I can't send them externally.

Now sure how to fix that.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
I am damn sure one cannot send from secondary email until someone has played around in ADSIEDIT or some other tool to try and make 2 Primary emails that way

- Rancy
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afactsAuthor Commented:
Well, I haven't done anything with ADSIEDIT.
I can send emails internally, my domain with the alias email, just not externally, so there has to be some exchange GURU's out there that would know the answer?????

Hopefully :)
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Yes you can have a secondary Mailbox\DL\PF and then assign them this Email and have SendAS rights on them and send from that address and if you want it back in your mailbox have set forwarding or Membership as what you decide initially to proceed with :)

- Rancy
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afactsAuthor Commented:
I'm a little lost from your post.  I'm not sure what you are trying to say?
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
I am saying you have to have any other Mailbox with that secondary email your trying to use emails from to External users

- Rancy
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afactsAuthor Commented:
Thanks, I just created a new account, and gave the user full access to that account, and that works fine.  Perhaps exchange doesn't have the option to allow to send emails using an alias email address.
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afactsAuthor Commented:
Thanks for the assistance!
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