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https://www.cyberciti.biz/faq/postfix-limit-incoming-or-receiving-email-rate/
Dec 15, 2006 · A bot connects to your Postfix email server and sends garbage commands or spam, attempting to crash your server. You can limit: => The length of lines in a message and so on => The size of messages => The number of recipients for a single delivery. Try following directives in your postfix main.cf config file:
http://www.porcupine.org/postfix/doc/rate.html
When a Postfix delivery agent (smtp, local, uucp, etc.) is unable to deliver a message it may blame the message itself or the receiving party. If the delivery agent blames the message, the queue manager gives the queue file a time stamp into the future, so it won't be looked at for a while.
http://www.postfix.org/TUNING_README.html
You can override this setting for specific Postfix delivery agents. For example, "uucp_destination_recipient_limit = 100" would limit the number of recipients per UUCP delivery to 100. If an email message exceeds the recipient limit for some destination, the Postfix queue manager breaks up the list of recipients into smaller lists.
https://en.wikipedia.org/wiki/Postfix_(software)
102 rows · Postfix and Qmail require parallel submission into different MTA instances once they reach …Initial release: December 14, 1998; 20 years ago
https://support.plesk.com/hc/en-us/articles/115001721733-Emails-to-Gmail-are-not-delivered-The-user-you-are-trying-to-contact-is-receiving-mail-at-a-rate-that-prevents-additional-messages-from-being-delivered
Jul 27, 2019 · CONFIG_TEXT: postfix/smtp[32699]: EB5F461000A2: host gmail-smtp-in.l.google.com[203.0.113.2] said: 450-4.2.1 The user you are trying to contact is receiving mail at a rate that 450-4.2.1 prevents additional messages from being delivered. Please resend your 450-4.2.1 message at a later time.
http://www.postfix.org/postconf.5.html
Time to pause before accepting a new message, when the message arrival rate exceeds the message delivery rate. This feature is turned on by default (it's disabled on SCO UNIX due to an SCO bug). With the default 100 Postfix SMTP server process limit, " in_flow_delay = 1s" limits the mail inflow to 100 messages per second above the number of messages delivered per second.
http://steam.io/2013/04/01/postfix-rate-limiting/
Apr 01, 2013 · This means that postfix will up to two concurrent connections per receiving domains. The default value is 20. default_destination_rate_delay = 1s Postfix will add a delay between each message to the same receiving domain. It overrides the previous rule and in this example, it will send one email after another with a delay of 1 second.
https://www.howtoforge.com/community/threads/postfix-dos-spam-attack.61196/
Mar 30, 2013 · Mar 29 22:43:35 server1 postfix/smtpd[7602]: warning: Message delivery request rate limit exceeded: 106 from unknown[90.146.13.50] for service smtp
http://postfix.1071664.n5.nabble.com/Rate-control-for-SMTP-delivery-to-speicific-domain-td47170.html
Rate control for SMTP delivery to speicific domain. Hello Everyone. Our company sends out newsletters to people who have subscribed their mail address in-store (retail). I have been working in...
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