recipient's destination email system is unknown or invalid.

D

DB

Can anyone tell me what this error message means. I started getting it
with a couple of internal email addresses (within my company) only today.
Everything's been working fine for years.

I only get it when I enter their email addresses from the address book. If
I type them in manually, the get sent out fine.

Thank you.
 
L

Lanwench [MVP - Exchange]

DB said:
Can anyone tell me what this error message means. I started getting
it with a couple of internal email addresses (within my company) only
today.
Click to expand...

Do you have an internal/in-house mail server? What kind?
Everything's been working fine for years.

I only get it when I enter their email addresses from the address
book.
Click to expand...

Where is the address book?
If I type them in manually, the get sent out fine.
Click to expand...

Also, what version/mode/SP level of Outlook?
 
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