Sympthom: my postfix/dovecot server stops connection requests on port 25 if the mail reject limit exceeds around 400 per minute. Port 25 is available but no 220 promt is coming. So I assume not enough smtp or amavis deamons on port 10024 10025 are available. A short postfix reload "solves" the problem, spammer are gone and connections are free agai for real users.
I did review my master.conf an see:
smtp inet n - n - 20 smtpd -o smtpd_proxy_filter=localhost:10024 -o content_filter=
But no smtp_client_connection_count_limit is set (a la):
smtp inet n - n - 20 smtpd -o smtpd_proxy_filter=localhost:10024 -o content_filter= -o smtp_client_connection_count_limit=10
Question: I've domains where the postfix accepts the smtp directly and I've domains which have a mailfirewall in front and refuses smtp from all other servers (mailfirewall = mx). This mailfirewall does also spam and virus checks and sends the "good" mails than to my postfix server. I assume that the "smtp_client_connection_count_limit" from above affects my mailfirewall too. How can I exclude my mailfirewall from this client_connection_count_limit (or how can I set a seperate limit for my mailfirewall) - or makes this no sense and the limit set is best solution?
For this mailfirewall I've condfigured in main.cf: check_recipient_access hash:/etc/postfix/recipient_access
:/etc/postfix/recipient_access: mydomain.tld check_if_mailfirewall_is_sender
main.cf: check_if_mailfirewall_is_sender = check_client_access hash:/etc/postfix/mailfirewall-ip, check_recipient_access pcre:/etc/postfix/nice_mailfirewall_reject.pcre, reject
Liebe Gruesse, Georg