UCEPROTECTL1 UCEPROTECTL2 UCEPROTECTL3
RBL Blacklisted UCEPROTECTL1 UCEPROTECTL2 UCEPROTECTL3
UCEPROTECTL1 UCEPROTECTL2 UCEPROTECTL3
UCEPROTECTL1 UCEPROTECTL2 UCEPROTECTL3
UCEPROTECTL2 UCEPROTECTL3
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IP Blacklist Check - See if your server is blacklisted
ABOUT BLACKLIST CHECK. The blacklist check will test a mail server IP address against over 100 DNS based email blacklists.



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3 RBL

There are 3 levels of blacklisting with UCEPROTECT:


UCEPROTECTL1 : listing of single particular IP addresses.



UCEPROTECTL2 : listing of multiple IP addresses



UCEPROTECTL3 : listing of whole ranges of IP addresses
ISP


https://mxtoolbox.com/blacklists.aspx

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gmail hotmail

RBL UCEPROTECTL2 UCEPROTECTL3


2 3

The major inbox providers are Google (Gmail and Google Workspace) and Microsoft (Outlook / Office 365 / Exchange).
Those two big providers use their own proprietary filters and algorithms to decide if your emails will land in inbox or spam in the mailboxes of their users.
They have their own way of scoring your sender reputation and it's much more reliable than relying on external blacklists.
And, as UCEPROTECTL2/3 is an external blacklist, in most cases, it's not taken into account by Google and Microsoft.

UCEPROTECTL3 lists hundreds of hosts including Namecheap, Digital Ocean, OVH, etc.

:
https://www.mailreach.co/blog/uceprotectl2-blacklist
https://www.mailreach.co/blog/uceprotectl3-blacklist