Outlook 2007

Tools > Options…

Mail Setup > [E-mail Accounts…]

Outlook 2007 - Mail Setup - E-mail Accounts

[Change…]

Outlook 2007 - Mail Setup - E-mail Accounts - Change

Change E-mail Account

Outgoing mail server (SMTP): rsxxx.realsender.com

[More Settings…]

Outlook 2007 - Internet E-mail Settings - Outgoing Server

Outgoing Server

[x] My outgoing server (SMTP) requires authentication

[x] Log on using

User Name: (the one we sent you)
Password: (the one we sent you)

[x] Remember password

[OK]

Outlook 2007 - Internet E-mail Settings - Advanced

Advanced

Use the following type of encrypted connection: TLS

[OK]