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https://tldp.org/HOWTO/Spam-Filtering-for-MX/smtpdelays.html
Beware that while you are holding up an incoming SMTP delivery, you are also holding up a TCP socket on your server, as well as memory and other server resources. If your server is generally busy, imposing SMTP transaction delays will make you more vulnerable to Denial-of-Service attacks.
https://www.mailenable.com/documentation/10.0/Standard/Delivery.html
There is also the option to only send delay notifications after a specified period of time from when the message send is first attempted. This will allow the SMTP service try to send the message more than once before the sender is informed that there is a delay.
https://support.microsoft.com/en-us/help/303734/how-to-configure-the-smtp-virtual-server-for-message-delivery
Apr 16, 2018 · In the MMC, click to select the SMTP virtual server, and then click Properties on the Action menu. On the Delivery tab, click Advanced to open the Advanced Delivery dialog box. For Maximum hop count, type a value for the number of hops a message can take between the source and destination servers. The default is 15 hops.
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://forums.iis.net/t/1188846.aspx?Delays+in+Mail+Delivery+from+IIS+6+0+SMTP
Apr 23, 2012 · Mail delivery from my SMTP Service on an IIS6 computer (W2K3SP2 with all the latest patches) is unaccountably delayed. I've coordinated with a user of an issue tracking software to see what the problem might be.
https://serverfault.com/questions/848029/postfix-sending-emails-with-delay
Therefore SMTP port 25 is not completely blocked but rather has limitations. Your Postfix configuration is ok for a stand-alone SMTP server, but the mail.log shows what is happening: after you reach the limitation, SMTP connections gets timed out and the mail gets deferred, postponed for a later try.
https://www.mailenable.com/kb/content/article.asp?ID=ME020148
Mar 10, 2020 · Delivery Delay Notifications. 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://docs.microsoft.com/en-us/Exchange/mail-flow/queues/message-intervals
The message expires after all delivery efforts have failed over a specified period of time. After a message expires, the sender is notified of the delivery failure, and the …
https://askleo.com/why_am_i_getting_a_delay_notification_on_an_email_i_sent-2/
Jan 28, 2016 · Delivery Status Notification (Delay) This is an automatically generated Delivery Status Notification. THIS IS A WARNING MESSAGE ONLY. YOU DO NOT NEED TO RESEND YOUR MESSAGE. Delivery to the following recipients has been delayed. The strange thing is that it is only happening with that specific email address. What does it mean, and why it is happening?
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