yahoo email blocks domains

@XfinityAlfonso​ From what I understand, the Yahoo Senders Hub (and Google's Postmasters Tools) are processes designed to help bulk emailers get the "Spam" association removed from their domain names.  That's all well and good for those companies burdened by the label, but I am an individual.  Opening a ticket with Yahoo Sender's has to come from a corporation.  I cannot do anything on the Senders Hub.

The fact remains: a company I have been doing business with for two decades (and sending/receiving email via Comcast the entire time), will no longer do business with me because Yahoo has some objection to said company.  And I doubt this company could never reach "Spammer" status- it is just too small.

You haven't answered my question: why did Comcast hide the fact that Yahoo censors mail?

I will make this company aware of this tool, but my problem remains.

We are unable to comment on Yahoo! Mail, but we recommend reaching out to Yahoo! Mail support for any further support. As the Yahoo Terms of Service were reviewed and accepted during the email transition, they will be the ones to further support your inquiry @user_9c9s5d. 

For the benefit of others who might come across this chain (I am not expecting any further comment or action from Comcast)...

I wrote to the company I need to work with and informed them of Yahoo Senders Hub.  This is their response:

We tried there "Sender Hub" with about 50 messages over 2 months and they never actually did anything except repeat the same nonsense over and over.

It became clear that their entire assistance team is on or or more or all of the following:

1.  managed out of another country that does not understand english.

2.  their people are not given the proper training to answer and assist.

3.  they are using some for of AI that is so poorly trained that it is criminally stupid.

4.  there is no human being inquiries to their system.

After the first couple of iterations, it became clear thet they decided that they were right and had no reason to assist anyone.  In fact, after the 2nd inquiry to them, the started just parroting the same insultingly incompetent information with nothing to add or assist.

After 2 months of getting nowhere, we too the step to reduce our members risk to their incompetence and stopped accepting any new registrations from AOL-YAHOO.

We have no reason or desire to "work with them" at this point because they have proven themselves to be an incompetent provider of email services.  We (and our customers) do not have to put up with that type of vendor and as such, the matter is closed and AOL-YAHOO is "dead to us".

In other words, lipstick on a pig and neither Comcast or Yahoo gives a hoot.

@user_9c9s5d​ 

You were expecting Comcast to do what?  Once you migrate to Yahoo! Mail, there's nothing further Comcast can do to help.

That says everything about the Comcast - Yahoo deal, their attitude towards their customers, and little to nothing about my expectations.  I am still a Comcast internet customer, after all.  And the dirty little secret you point out - once done, it's over - one realizes after the fact.  Pity all the fools.

Comcast can and should go back to Yahoo and protect its customers.  'Nothing Comcast can do' is utter nonsense.  Surely both companies have project managers assigned to this migration.  These are exactly the people to deal with this sort of problem.  Yet here we are, made ignorant or impotent by gatekeepers.