Outlook 2007 External SMTP Authentication

Hello,

Since I switched to Microsoft Office (Outlook) 2007, I can no longer send messages using an email account (Account A) that does not provide an outgoing server (SMTP). For this account, I use the outgoing server from a second account (Account B). Therefore, I use pop3 and smtp referring to two different servers, and I use the Additional settings... / "Outgoing server" tab / Checked box "My outgoing server (SMTP) requires authentication" / Checked box "Log on using" ... and there I enter my Username and Password for my Account B.

Here is the error message Outlook gives me:
" ! The task " ###@###.### - Sending " reported an error (0x800CC80) : " None of the authentication methods supported by this client are supported by your server. " "

Two clarifications:

- With exactly the same configuration parameters on another computer using Microsoft Office (Outlook) 2003, I can send an email. (However, I do not use the same internet security suite on this second computer, Kaspersky 7.0 on the computer concerned by the problem. However, if I disable (only disable, I do not uninstall it) the said security suite, the problem remains)

- I have no problem sending messages with my Account B on the same computer that has issues with Account A, and this using the same outgoing server settings (however, I do not have to go through additional settings in this case).

Thus, it seems to me that this is a problem with Microsoft Office Outlook 2007 primarily related to authentication.

My problem is very similar to another issue discussed in this forum previously ( http://www.commentcamarche.net/forum/affich 3576440 probleme envoi de mail depuis l etranger ), however, when I try the final solution proposed, I manage to no longer have an error message when I use the "Test Account Settings..." function, but I still cannot send a message with my Account A

Thank you.

Fred
Referring to this discussion