I've had domains listed in Google Postmaster Tools since 2016.  Never
gotten one lick of any information from any of those except for "No data to
display at this time. Please come back later. Postmaster Tools requires
that your domain satisfies certain conditions before data is visible for
this chart."

I eventually stopped adding domains because it didn't do me any good.

The 173.225.104.91 server has sent 68 emails to gmail.com email addresses
thus far in January 2024.  As far as I know, this block just happened
today.  Today was the first time it was brought to my attention that
messages from this server are going into the spam folder.

Again, how am I supposed to know that Google is treating this IP's
reputation poorly?

How am I supposed to remedy a low reputation?


I set up another domain on the same 173.225.104.91 server, SPF, DKIM, and
DMARC all set up (and verified with https://www.learndmarc.com).  Sent a
message to an @gmail.com address through this account, and it went to the
spam folder.

Set up the same domain on another server - 205.209.102.251 - which,
coincidentally is also an Interserver IP.  Again, verified that SPF, DKIM,
and DMARC were all set up with https://www.learndmarc.com.  I sent the same
test message to the same @gmail.com address.  Message came through in the
INBOX without incident.

What conclusions would everybody else draw?


It's frustrating because none of the too big to fail email service
providers have any way to test a sending IP or sending domain's reputation
with their service.  They block them or weigh them heavily without any
method of remediation.

It would be nice if I could check the reputation of my outbound IPs daily
and be proactive in remedying any issues with these major email service
providers, rather than have to be told by my clients that something is
amiss.  And then battle through a 2 week waiting period for the provider to
reply back or hope that someone from the provider is on MailOps and can
provide any insight.
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