Recent content by tetrahall

Sebahat.hadzhi, Many thanks for your reply. Actually, after my previous message, I contacted support of our hosting company seeking their advice. They suggested, as a first step, to "reboot" the server and flush the mail queue with the command "postqueue -f". This has worked. No more...

Another indication that it hasn't worked is that the mail log still states hotmail/outlook "Concurrent Connections" problem.

Sorry, it doesn't work for me. Every source on google just mentions the steps I outlined in the first post. This command: # postconf | grep concurrency_limit still yields: hotmail-throttle_destination_concurrency_limit = $default_destination_concurrency_limit Could the answer lie in this...

Thanks, I will try that.

Also, the following command should display customized (non-default) concurrency settings in main.cf file #postconf -n | grep concurrency But it doesn't display anything!

scsa20, Thank you. The error message has disappeared. However, to displays all limits, I run this command: # postconf | grep concurrency_limit it yields several lines... default_destination_concurrency_limit = 20 hotmail-throttle_destination_concurrency_limit =...

Hello, I'm trying to reduce the "Concurrent Connections" for sending hotmail/outlook emaails. The default value is 20. Hotmail requires a value of 3. So, I;ve added certain lines at *the end* of the following files in postfix. master.cf hotmail-throttle unix - - n - 3 smtp -o...

No, it's not an eCommerce website. Thank you for mentioning Cloudflare. We will keep that in mind should the need arise.

Hello again Kaspar :) Thank you for your input. It is both, their ip addresses and the pattern of their visits. I know the normal pattern of genuine visitors. You are right, as "ChristophRo" has already mentioned, ipset is the way to go. The issue is now resolved. Thank you all very much.

In my case, they come from different networks and different countries,

scsa20, thanks a lot for your reply. It's very useful to know that. I consider my post resolved now. But I cannot mark it myself. All the best!

One last question, please: Does/can it ever happen that the actual source of the visitor is from a country X, but when I check the country of the ip address I find it is from country Y? In other words, can users fake their actual locations?

ChristophRo, thank you. This looks more like it. I will try to learn ipset, hope it is not complex.

In addition, one may need to block IP addresses from a certain country, not the country - some visitors might be genuine or useful, for example, Google from USA

scsa20, thank you for your reply. I will try changing the database to Maxmind. You mentioned "The other method is utilizing ModSecurit ..", but it looks like the same as blocking countries in Plesk's firewall, isn't it? And if one is to use IP addresses instead of countries, each address has...