Yes they can. There is a limit in the RFC. It's either 1024 or 2048
characters I think (wild guess...)
Check the RFC for a definitive answer.
Cheers
On 13/05/08 7:28 AM, in article
3EE1A6B6-CB8C-4A8D-BC1C-D61AD2711BAE@microsoft.com, "SR"
> If we try to send a message to two distribution lists, we get -- "An
> unexpected error has occurred "- on a Microsoft Office Word dialogue box.
> We've not found any the email addresses that are wrong.

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John McGhie, Microsoft MVP, Word and Word:Mac
Nhulunbuy, NT, Australia. mailto:john@mcghie.name