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What is mixed delivery mode (Direct delivery with backup SMTP server)?

April 26, 2017backup DELIVERY mixed mode server SMTP

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What is mixed delivery mode (Direct delivery with backup SMTP server)?

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This delivery mode sends messages directly at first, if the direct delivery fails, then KMailer will use the backup SMTP servers you assigned to send the message again. With this delivery mode, you can avoid overloading your SMTP servers as well as improve the sending success ratio dramatically.