Getting blacklist when try to do check if email can deliver

Hi all.
My website is running a verify email to query smtp server the perform these command

Note : the mail from {myemail}@mydomain is not real and my server dont have spf and dkim yet

HELO mydomain

MAIL FROM: <mymail@mydomain>

RCPT TO: <[email protected]>

QUIT

After running these command i get black list on eXploits Blocklist (XBL) & CSS Blocklist (CSS).
I check issue from spamhaus and this is the detail infomation :

(IP, UTC timestamp, HELO value)

{hide my ip :O} outlook.com

Notable things about the HELOs:

• They are often dynamic-looking rDNS, and claim to be from geographically very different networks
• They can include impossible HELOs like "gmail.com", "outlook.com", "comcast.net" - Gmail, Outlook and Comcast do not use these. These are all fake.
• The cause of this problem is frequently found to be coming from an phone or laptop with "free" VPN or channel unlocker, "free" streaming apps.

This can be caused by a spambot infection or a server misconfiguration.

First check that the HELO settings are correct. This can be done by sending an email from {hide my ip :O} to "[email protected]". A bounce that contains the required information will be returned immediately. It will look like an error. It is not. Please examine the information in the body of the email. NOTE: "[email protected]" does not currently work with IPv6.

If the HELO settings are correct, then there is a spambot or some other kind of malware!


What step i need to take in order to not get blacklist like this in the future. Thanks in advanced!