I'm having some trouble sending messages to Yahoo. This started 15 days ago. the error message that appears is:

Error: "421 4.7.0 [XXX] Messages from x.x.x.x temporarily deferred due to user complaints -" when sending email to Yahoo

I already questioned in Yahoo on the problem but the answer was standard, ie check Ip Reverse, check SPF, etc and such ... All right with all the settings.

Has anyone ever had this kind of problem with Yahoo and has some solution?

Thanks for any reply.