If are sending through your own Server, your server is going to have limitations for the number of emails you can send simultaneously. When sending through Tout, you have the ability to send many emails, but we will try to send them at the same time, so if you are aware that your server is going to cut you off at 100 emails per minute, you will need to only send 100 emails through toutapp.com at once. Otherwise, the emails can land your Failed Delivery folder, because they are being throttled by your email delivery provider.
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