iDRAC 8 - RAC0225 sending email failed

Hello. I've read multiple posts regarding this issue and read this setup guide multiple times - https://www.dell.com/support/kbdoc/en-ai/000131098/dell-idrac-configuring-email-notifications-for-system-alerts-on-idrac7-8-and-idrac9#iDRAC87

All the setting are correct, however it still fails to send an email.

Using the same exact settings I am using on idrac 8, they work on all the idrac 9 servers.

I'm at my wits end on why it doesn't work for my idrac 8 clients. On one specific client, yes, I am using the latest firmware on it, version 2.86.86.86. On the others, I haven't bothered updating because they also fail.

I wish there was some log we can see. Also, no idrac.RemoteHosts.ConnectionEncryption does not exist on idrac 8. That is only on idrac 9.

I've done a reset idrac on 2 of them and still fails. Any other magical ideas I can try?