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A few questions. Email relay and x400 and x500

When system uses the exchange server as a relay to send automated messages to a user or distro and it doesn't  arrive or something is wrong, does the exchange server just drop it. since there is no NDR? I'm using EX2003 SP2. Is there someway to track it?

We migrated from 5.5 to 2003 awhile ago and wanted to know why we have some accounts with x400 address and some with x400 and x500. Can we get rid of one of them and how?

I used ADmodify to add an email address to every account in Active Directoy, whcih was firstname.lastname@domain.com and set to be the primary. Some peolpe's last names have hyphen's (-) in them. like Firstname.Last-name@domain.com. Is this a vaild address, or do I need to change them. I know some of the other user IDs were invalid and already chaged them. They were like First(name).Lastname@domain.com. Why wouldn't these people receive email from with the domain, I thought ex2003 used x400 or x500 to send email within the Org?

If these are too many for one question, i can re-ask them in another question. I just thought the first 2 question were fairly easy.

1 Solution
Hyphens and underscores are both valid addresses. I don't use underscores myself.

X.400 addresses should not be removed. Those are used by Exchange internally. X.500 address can probably be removed as long as you have no applications using those addresses.

The first issue I would separately, as it could require some discussion and exploring of options.

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