I'm seeing a lot of TS03 in yahoo for /24 , i have everything setup properly does yahoo blocks RIPE ips? Anyone is having the same problem?
https://help.yahoo.com/kb/SLN3436.html ts03 error happen when this range already sent bulk mailing to yahoo and it wont receive emails from it anymore.
Seems like Yahoo does not like this range anymore. However, sometimes it suddenly get recovered. Anyway, your best bet is to get another range.