Outlook 2013 2016

File > [Info]

Outlook 2013 2016 - Account Information

[Account and Social Network Settings]

[Account Settings…]

Outlook 2013 2016 - Account Settings - E-mail Accounts

[Change…]

Outlook 2013 2016 - mail setup - email accounts - change

Change E-mail Account

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

[More Settings…]

Outlook 2013 2016 - internet email 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 2013 2016 - internet email settings - advanced

Advanced

Use the following type of encrypted connection: TLS

[OK]