Sending some automated emails through SES inside the organisation but those are directly going to junk folder of Outlook mail. Could anyone suggest how to solve this problem?
Outlook junk email logic is a little tricky. Even if you add the sender to your safe list, or disable automatic filtering in "Junk E-mail Options" (i.e. only emails from blocked senders are sent to Junk email folder), Outlook could still flag some emails, even internal emails, as junk.
If completely disabling automatic filtering in Outlook is an option for you, you can update the following registry entry to "1".
HKEY_CURRENT_USER\Software\Policies\Microsoft\office\16.0\outlook
DWORD: DisableAntiSpam
Value of 1 disables the junk filter, 0 enables it
Note: Version 16.0 is for when you are using Outlook 2016. It will be different if you're using a different version.