We (and many other sites) are having issues delivering emails to the yahoo domain (@yahoo.com) over the past couple of weeks, due to some anti-spam changes implemented at yahoo recently.
The majority of emails (subscription, password recovery etc) are all bouncing back with the following error.
554 5.7.9 Message not accepted for policy reasons. See https://help.yahoo.com/kb/postmaster/SLN7253.html
We are trying to get in touch with Yahoo to solve this issue. Meanwhile if possible try to change your email address, or send a request to helpdesk for manual password recovery if you are not able to receive emails from us at your yahoo.com email account.
p/s yahoo.com.my accounts don't seem to be affected at this point in time.
[SOLVED] Issues with yahoo email (@yahoo.com)