smtp - send email error : Error 550, User account support@mydomain.com has sent too many emails -
i have forum, base on php (for many years). 1 user pointed out in recent days, email sending system not work properly. went cpanel (in host) , tried send email (with squirrelmail or roundcube). but in squirrelmail, when send email, see following error : (( requested action not taken: mailbox unavailable 550 user account support@mydomain.com has sent many emails )) and in roundcube : (( smtp error (550): failed add recipient "example@yahoo.com" (user account support@mydomain.com has sent many emails). )) i've never sent spam e-mails , website ip not on blacklist emails. created new email accout (with no special restrictions), faced same error. that means point blank host trying send to, has blocked server. spam complaints or other abuse issues, or because server misconfigured. need contact host in question ask why have decided block server. should check see if server has been blacklisted. site use check is: mxtoolbox.com on message, providers pu...