Re:Show HN: Personal messaging with a 2-7 day delay
by LinuxBender on Wednesday February 17, 2021 @10:45AM
(#26167645)
Sortof related: I just wanted to add that many MTA's email servers also support this concept. Using milters or scripts, you can default emails to be stored in the hold queue, then release them based on ingestion time.
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Re:Show HN: Personal messaging with a 2-7 day delay
by frits1993 on Wednesday February 17, 2021 @11:08AM
(#26167957)
Cool, I did not know that. Are there any other thinkable use cases of keeping messages in a hold queue for a longer period of time, for this option to exist?
Re:Show HN: Personal messaging with a 2-7 day delay
by LinuxBender on Wednesday February 17, 2021 @11:52AM
(#26168504)
Some sysadmins/postmasters do this to protect against spam floods. They use cron jobs to hold/release emails after validating the envelope contents using tools like MailScanner. Some use that for intercepting test messages [1] I don't have the links handy, but I have also seen some projects in github that utilize hold queues for managing more granular rate limits based on content rather than destination. Some anti-spam tools will also quarantine messages into the hold queue for review.
[1] - https://serverfault.com/questions/219173/configure-postfix-t...