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How quickly do the Back-up Email servers send mail back to primary email server?

April 26, 2017back-up email email server mail primary quickly send servers

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How quickly do the Back-up Email servers send mail back to primary email server?

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If your mail server supports the ETRN SMTP command then it will automatically request immediate delivery from the backup mail servers. This can also be done manually by using telnet. If your mail server does not support the sending of the ETRN SMTP command then the backup email servers run on a set retry schedule every few minutes.