Hi, Denis,

I just tested this using both Direct and MAPI settings within Payables and all is working as it should.

Something else has changed at your office that is affecting this. The message you are receiving is not an Adagio message. It's from Windows: http://support.microsoft.com/kb/813745

Are you trying to send a single email or multiple. Even if your default email client is set, if sending multiple, it's possible your email client thinks you are trying to send spam.

Are you using MAPI as your email setting or Direct?

Is anyone else in your office able to email using Adagio? What about from Receivables or Invoices?