After change authentication issue user and email

Hey,

I have a test SharePoint with one web application. At the creation this webapp uses NTLM authentication. Then was form based authentication activated (with an aps.net database). Now the web application changed back to NTLM authentication.

Everything works fine. Without send an email (workflow, task list,.. ) to an user. It seems that SharePoint cannot configure where the right user is. Can I fix this issue or must I recreate the complete web application?

If I create a new site collection in the same web application the email send function works fine.

Thanks for help

Stefan

Viele Grüße Stefan

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