>hi Sergey:
>
>Yes. In both cases (MS Outlook and Outlook Express) a security messagge appears. When "allow" button becomes enabled I click and the error ocurrs (MS OUTLOOK) and mail is sent (Outlook Express)

See, if you can install http://berezniker.com/content/pages/office/get-rid-annoying-security-alerts-microsoft-outlook and this would probably solve your problem.