Have any of you encountered the below warning message? So far, it appears to be isolated to only three users who are each using Eudora 4.1 to send email to our lists. However, there are other users who are using the same version of this email client without producing the error. In addition, we've now discovered that one user can send email to the same list and only produce the error intermittently. The messages are always sent the same way, but with different results; sometimes with the warning message and other times without. If any of you have encountered this and know of a remedy, please share. Actually, even if you don't know of a remedy but care to share what you've tried in an effort to rid yourselves of the messages, that would be nice as well. It could possibly save me some steps. >>Comments: RFC822 error: <W> MESSAGE-ID field duplicated. Last occurrence >> was retained.