Yahoo's algorithm regularly sends conservative news sources to the spam folder even after repeatedly whitelisting the sender, adding to contact, marking as "not spam" etc etc.
As an unaffilliated voter I value news sources from all perspectives and if the US Postal Service isn't allowed to not deliver mail properly simply based on the senders political affiliation then email services like Yahoo shouldn't be allowed to do it either. Quite frankly, it's sad and pathetic that we have to tell people these things are wrong.
In the future I will only be using my 20 year old Yahoo mail account only for sites that I suspect will spam my inbox because that is all Yahoo has earned from me.