Do you have any limit on sending emails?
Posted by Wang Lili on 27 November 2010 07:05 AM
To every domain, there’s a 500 outgoing email hourly limit, which also applies to Mailman. Once you send over all 500 emails in any hour most of them will bounce back with an undeliverable error, then your account will be unable to send email for some time. So as a courtesy, we recommend you to wait at least 1 hour after this issue occurs before trying to send email again. 
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