AutoSupport not working over SMTP - KB 1015614

Hi friends,

I got the following error when a node try to send Autosupport to a SMTP host (FAS8020 - Ontap 9.2.x):

error message: FTP: weird server reply

Do you have any idea?

The only KB that matches the error message is the following:

https://kb.netapp.com/app/answers/answer_view/a_id/1015614/loc/en_US

But It seems has no contents (even logged in with my account). 

Would you guys have complete access to the KB above?

Thanks!