Sim, estou resolvendo esse problema agora para um usuário. Fiquei triste ao ver que ninguém deu uma resposta. O que eu encontrei até agora é que o código de erro -50 é paramErr - Erro na lista de parâmetros do usuário. E eu encontrei algumas soluções, mas ainda tenho que testá-las para ver se funcionam. Portanto, tente por sua conta e risco!
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One user found this solution: Run "Remove Office", then run Repair Permissions. Install from your CD and apply all updates. Restart and then run Repair Permissions again.
Another cause for this error was found by [name omitted]: I had a semicolon in my outgoing server name.
Another user reported this fixed the issue for them: Try creating a new Entourage identity and setting up your email account. When the email address is verified with the new identity and you receive your e-mail, then try switching back to the identity that you had a problem with and check your mail. This solved the problem for me.
[Name Omitted], reported this solution: I found old mails in my outbox that were never delivered (for an unknown reason), but everytime I wrote a new mail, Entourage tried to send them again, leading to a -50 error everytime. Deleting these old entries in my outbox resolved the problem.