Google Apps mailserver - works fine for < 50 messages; problems when sending more

holdz

New Member
My asp.net (mvc2) web app webinar registration system sends emails with connection info. Currently we just loop thru the list of attendees and hit a System.Net.Mail.SendMail for each. We send mail via our GoogleApps account (non-premium).My use case is to send < 50 emails at a time and the system's been working fine. On the occasions where the number pushes a 100 addresses I find error returns with the message:Service not available, closing transmission channel. The server response was: 4.7.0 Try again later, closing connection. (MAIL) g31sm4823143ibh.4Is this message specific to Google's servers (searched on the phrase - seems like 'no'). Is there a recognized 'best practice' for sending emails by code?
 
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