distribution list error

[Duck]

I cannot send any email to a distribution list. It tells
me an unexpected error has occured. How can I fix this
issue?

 

[Lanwench [MVP - Exchange]]

Version/mode/service pack level of Outlook? (look in help | about)

Is this a distribution list in your contacts? Have you verified all the
email addresses therein to ensure there aren't any address formatting
errors?

 

[Guest]

2003, SP1, security mode default. I used to be able to
send to everybody in the list and now I cant.

 

[Lanwench [MVP - Exchange]]

And as to the address formatting?

2003, SP1, security mode default. I used to be able to
send to everybody in the list and now I cant.