Koozali.org formerly Contribs.org

mail from one client does not arrive

Offline mmccarn

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Re: mail from one client does not arrive
« Reply #15 on: August 07, 2019, 12:22:38 PM »
My contact there wrote, "...not able to connect to your email server..."

Fail2ban on your SME server might cause this.  It took me a while to get fail2ban->IgnoreIP set correctly.

You could also search the Firehol blocklist-ipset github repo for your SME server's WAN IP address to see if you've been listed in any firewall-level blocklists.  Search for your full IP, then search for the first 3 octets (then 2, then 1) in case you're listed as part of a netblock.  Put quotes around your search string to keep Github from returning every entry containing any of your octets...

Re: mail from one client does not arrive
« Reply #16 on: August 12, 2019, 12:16:35 AM »
Thank you for the suggestion. We added the IP addresses used by our client to the fail2ban whitelist. Hopefully that will help.

I looked through the Firehol blacklist, or at least some it. It appears to be quite extensive.
- Mark