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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.postfix.org/TUNING_README.html
The Postfix smtpd(8) server can limit the number of simultaneous connections from the same SMTP client, as well as the connection rate and the rate of certain SMTP commands from the same client. These statistics are maintained by the anvil(8) server (translation: if …
http://www.porcupine.org/postfix/doc/rate.html
uucp_destination_recipient_limit = 100 would limit the number of recipients per UUCP delivery to 100. You must be careful when increasing the recipient limit; some SMTP servers abort the connection when they run out of memory or when a hard recipient limit is reached, so the mail won't get through.
http://steam.io/2013/04/01/postfix-rate-limiting/
Apr 01, 2013 · If you want to disable this rule, either delete it or set to 0. default_extra_recipient_limit = 10 Limit the number of recipients of each message. If a message had 20 recipients on the same domain, postfix will break it out to two different email messages instead of one.
https://serverfault.com/questions/614058/how-to-rate-limit-outgoing-smtp-connections-for-postfix
I have a postfix instance running on a VM. The VM provider shuts us down if we exceed a threshold of SMTP connections per minute - something like 10. In a typical day we might send 1000 messages, so 10 is fine. However it is a mailman server so the peak rate often exceeds 10. The port 25 is then blocked for a while. This creates a backlog.
https://wiki.deimos.fr/Postfix:_limit_outgoing_mail_throttling
default_destination_concurrency_limit: This means that postfix will up to two concurrent connections per receiving domains. The default value is 20. default_destination_rate_delay: Postfix will add a delay between each message to the same receiving domain.Last Update: 06/08/2015
http://www.postfix.org/postconf.5.html
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 …
https://serverfault.com/questions/581183/postfix-limit-sending-rate
This is the default limit for delivery via the lmtp(8), pipe(8), smtp(8) and virtual(8) delivery agents. With per-destination recipient limit > 1, a destination is a domain, otherwise it is a recipient. try. smtp_destination_recipient_limit = 2. smtp_destination_concurrency_limit = 2. smtp_destination_rate_delay = 1s
https://www.howtoforge.com/community/threads/postfwd-rate-limit-per-recipient-domain.72639/
Jul 05, 2016 · Hello, Can anyone suggest how to configure postfwd (w/ postfix) to rate limit incoming messages per the 'destination recipient domain'? I tried numerous commands in postfwd.cf, while in main.cf postfwd is set under 'smtpd_recipient_restrictions', but I can never reach the desired result.
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