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!