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https://tldp.org/HOWTO/Spam-Filtering-for-MX/smtpdelays.html
The default timeout of such Sender Callout Verifications is 30 seconds - if you impose delays this long, the peer's sender callout verification would fail, and in turn the original mail delivery from you/your user might be rejected (usually with a temporary failure, which means the message delivery will be retried for 5 days or so before the mail is finally returned to the sender).
https://support.microsoft.com/en-us/help/303734/how-to-configure-the-smtp-virtual-server-for-message-delivery
Apr 16, 2018 · If a message cannot be delivered on the first try, the Microsoft Simple Mail Transport Protocol (SMTP) Service sends it again from the Queue directory after a specified time. You can set the interval between delivery tries and also designate the number of times to try to deliver a message.
https://serversmtp.com/email-delivery/
If your SMTP server is too loaded, your outgoing emails can be queued – that is, their delivery is temporarily delayed. Email delivery failure and other problems Why sometimes your emails are not delivered (because of bounces, malware attacks or SMTP issues), and how to fix that.
https://stackoverflow.com/questions/835743/how-can-i-delay-mail-delivery-through-an-smtp-relay-possibly-sendmail
If you want to just delay mail delivery, there is also a number of ways to do it, depending on why you want to do it. One popular solution is greylisting, it does just the following - when a host connects to your MTA (sendmail, f.ex.), it gets bounced with the prompt to try again in some time interval. A properly configured mailer will just do that - it will try sending the mail again and eventually the message will be …
https://www2.rivier.edu/faculty/vriabov/Information-Security-SMTP_c60_p01-23.pdf
responds (the receiving SMTP) to the session request. Be-cause the client SMTP frequently acts as a server for a user-mailing program, however, it is often simpler to re-fer to the client as the sender-SMTP and to the server as the receiver-SMTP. An SMTP-based process can transfer electronic mail to another process on the same network or to another
https://serverfault.com/questions/1530/iis-smtp-long-delayed-deliveries-possible
The expiration timeout for the SMTP server is set 2 days. The Delay notification is set to 12 hours. Finally, I'm not terribly well-versed in reading the SMTP logs. (I can read the W3SVC logs no problem, but the SMTP ones I'm not familiar with the numeric status codes.) So any help there would be appreciated as well. Thanks!
https://www.wordexceltemplates.com/explanation-letter-for-delay-in-delivery-due-to-covid-19/
Explanation Letter for Delay in Delivery due to COVID-19 Letters April 3, 2020 April 3, 2020 Kate No matter whether you have set-up a small business or a big organization, meeting up the deadlines shows how much professional you are in your business.
https://community.spiceworks.com/topic/2150917-exchange-2013-delivery-is-delayed
Jul 25, 2018 · Exchange 2013 delivery is delayed. by bob_holla. on ... Nemesis ESMTP Service not available 451-4.4.0 554-No SMTP service 451-4.4.0 554-Bad DNS PTR resource record. 451 4.4.0 554 For explanation visit ." Attempted failover to alternate host,
https://www.mailenable.com/kb/content/article.asp?ID=ME020148
Mar 10, 2020 · If a user is receiving delivery delay notifications, the message is most likely still queued for outgoing delivery on the MailEnable server. Determine why messages are generating delay notifications by reviewing the SMTP Activity and Debug logs.
https://www.docformats.com/apology-letter-for-delayed-shipment/
We are aware and very sorry for the delay that occurred on [date] in the delivery material. We didn’t expect such event to occur. We accept and apologize that we have failed to deliver the material you ordered from us on [date] Ideally this is not our norm and is absolutely not acceptable.
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