On Sun, Sep 01, 2013 at 04:12:28PM -0400, Roman Gelfand wrote: > host ALT2.ASPMX.L.GOOGLE.com[74.125.136.27] said: 450-4.2.1 The user > you are trying to contact is receiving mail at a rate that 450-4.2.1 > prevents additional messages from being delivered
The user is receiving too much mail, there is no indication that you're sending the (majority of the) offending mail, so often the problem is not your fault. If you have a mail loop generating a lot of mail for the user in question then the issue is yours. Check your logs. -- Viktor.