Spam all long got.
For example, on Yukha is just a mockery - I have 99 percent of mail — spam.
And this is despite the fact that it is actively advertised that Yaha is the number one mail against spam.
Maybe one nomeo - but only on a paid basis.
And here for example mail on Yo -
www.yo.tj 
There are practically no problems with spam. And most importantly, it is not actively advertised - they say super mail without spam is number one. Just works efficiently. Without many words. This is not PR. It is a fact.
Yes - by the way - the mechanics and the SMTP engine itself are no worse than others. Same fact. Fact proven by time.
Hence the conclusion - Yaha specifically gets spam - allows spam to burst into the bulk folder in the box, so that people (and the main target audience - the USA) are tired and buy a Premium account.
Not good - but businesslike.