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https://techcommunity.microsoft.com/t5/exchange-team-blog/so-how-does-this-039-deferred-delivery-039-thing-work/ba-p/610174
While the phrase "deferred delivery" might make you think that message is held on the destination server, it is in fact held in the queues on the source server. From the end-users perspective, the message immediately disappears from their mailbox and they cannot modify it if something occurs to them later.
https://www.outlook-tips.net/tips/tip-149-deferred-delivery/
Jun 24, 2004 · To create a deferred delivery rule, open the Rules Wizard and select the option to start from a blank rule and choose to create an after sending rule. The deferred delivery option is near the bottom of the list. The maximum amount of time you can delay delivery is 120 minutes.
https://support.microsoft.com/en-us/help/2490134/a-deferred-delivery-email-message-is-not-delivered-by-using-outlook-20
Jun 21, 2014 · Fixes an issue in which you cannot send a deferred delivery email message by using Outlook 2007 in online mode in an Exchange Server 2010 environment. This issue occurs when the Outlook 2007 client has an additional add-in in the Outlook Profile, such as POP, IMAP or Live meeting.
https://serverfault.com/questions/472312/schedule-queue-large-e-mails-in-exchange-2010-defer-until-latency-drops
Even IIS SMTP has a deferred delivery mechanism that it would seem Exchange 2010 does not. You could redirect large messages to the IIS SMTP server which could store them on disk, and, checking for latency first, have the IIS SMTP server send them via a script when latency is low.
https://community.spiceworks.com/topic/2010916-emails-being-deferred-by-exchange-server
Jul 19, 2017 · Get answers from your peers along with millions of IT pros who visit Spiceworks. Currently we are setup with exchange 2013 and Barracuda Essentials for Email Security. When emails from an external source are sent through Barracuda for scanning then onto our exchange server we get a response in Barracuda...
https://docs.microsoft.com/en-us/Exchange/mail-flow/queues/queues
SMTP Delivery to Ex Online: SmtpDeliveryToExo: This value isn't used in on-premises Exchange. n/a: n/a: n/a: SMTP Delivery to Mailbox: SmtpDeliveryToMailbox: The queue holds messages for delivery to Exchange 2013 or later mailbox recipients. The destination mailbox database is in one of the following locations: • The local Exchange 2013 or later Mailbox server.
https://support.office.com/en-us/article/Delay-or-schedule-sending-email-messages-026af69f-c287-490a-a72f-6c65793744ba
Delay or schedule sending email messages. Outlook for Office 365, Outlook 2019, Outlook 2016, Outlook 2013, Outlook 2010 ... You can delay the delivery of an individual message or you can use rules to delay the delivery of all messages by having them held in the Outbox for a specified time after you click Send.
https://docs.microsoft.com/en-us/Exchange/mail-flow/queues/message-properties
Indicates why the message was deferred. If the message wasn't deferred, this property has the value None. A deferred message is returned to the Submission queue because of transient errors that were encountered during recipient resolution. For more information about deferred messages, see Recipient resolution in Exchange Server. The possible values are:
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