Can I create my own e-mail server IP blacklist (RBL/DNSBL) with Simple DNS Plus?

Yes, there is a free plug-in available for Simple DNS Plus v. 5.0 for exactly this purpose.
See the reference article below for details.

REFERENCE:
For more information, please see the following knowledge base article:

KB Article DNS Blacklist (DNSBL / RBL) Plug-In

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