sendmail rejecting messages with error connection limit rate exceeded.
 

I am running debian jessie with sendmail 8.14.4. I do not find where is the setting to disable the mails to be rejected for a certain host and i get periodically this message:

I have removed from sendmail.mc the configuration

still the messages are rejected which I do not understand because those option would delay the messages and not reject them.

is there a way to disable for certain domains that there is no connection limit at all? need to recompile? downgrade? I am using sendmail installed via apt-get.

thank you.

sendmail rejecting messages with error connection limit rate exceeded.
 

CONNECTION_RATE_THROTTLE

This sets a limit on the number of new connections per second. It helps protect you against mail-bombs and similar denial-of-service attacks.

define(`confCONNECTION_RATE_THROTTLE', `100')dnl

If the rate goes above the limit, new connections are rejected and the sending mailers have to retry later.

After editing sendmail.mc you need to recompile it to create the corresponding sendmail.cf:
Don't forget to backup both files in case something goes wrong. Then restart the sendmail service

Or you can just disable throttling for the host in question. Edit/etc/mail/access and add:
Then run:

Hello,
thank you for your help..


I understand that CONNECTION_RATE_THROTTLE delays the message do not reject it.

i see this on the doc online i find:

define(`confCONNECTION_RATE_THROTTLE', `5')dnl
This defines the overall number of concurrent connection the server accepts per second, before queuing incoming connection-request regardless of the host. The connections will not be rejected but stalled until the next second. This means that for the above example that when 20 connection-requests arrive, the first five (1-5) are processed in second one, the second five (6-10) in second two, the third five (11-15) in second three, and the final five (16-20) in second four.

this is not my case as my connection are simple rejected

I think I may have found the issue: sendmail.mc has this two rules:

dnl # Stop connections that overflow our concurrent and time connection rates
FEATURE(`conncontrol', `nodelay', `terminate')dnl
FEATURE(`ratecontrol', `nodelay', `terminate')dnl

but how can I find the current connection rates.

I will test with applying the rule ClientRate on the access DB.

thank you all for your answers.

Mario.