Problems with authentication SPA in application VB.net using System.net.sockets

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VB

Hello!

I use the namespace System.net.sockets to host with one application to manage e-mail boxes. The connection is made via POP3 or STMP, as data authentication server did not encounter any problems, but there is an e-mail that is the option SPA - Security Password Authentication selected, and I cannot access this account, when previously this option was not shown enter without problems. I tested connecting directly from Outlook to this mailbox and had no problems. I need to do this to inform the act of authentication that this account has the option SPA selected.

Thanks,

Alisson