Maximum connections: The maximal numbers of mails which can be connected to a certain server at one time.
Delay after failure in seconds: It is possible for the network reason, the delivery failed. Set "delay between retries" can improve the sending efficiency. When certain mail is failed, the latter mails will be aheaded when doing the delay process, the speed and efficiency of mail sending will be improved.
Maximum continuous connection: The continuous delivery times of sending mails to one domain name and delay.
Delay for continuing in seconds: Delay between continuous delivery.
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