> Relay under heavy network load - really many what to connect it. > And I start to get > "421 Too many concurrent SMTP connections; please try again later" > in logs.
> But I don`t use rate limiting. What else can make this? And how can I change it? On which server and from which direction. Is that on "=>" log-line or is your server denying connections? Because it affect which server you need to tweak. More to read, exim documentation 14.10 "resource control". http://www.exim.org/exim-html-current/doc/html/spec_html/ch14.html#SECID105 Mostly you should be interested in options: smtp_accept_max simultaneous incoming connections smtp_accept_max_per_host connections from one host
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