danami
Silver Pleskian
Username:
TITLE
Stop using zen.spamhaus.org as a DNSBL example on the Mail Server Settings page
PRODUCT, VERSION, OPERATING SYSTEM, ARCHITECTURE
Product version: Plesk Obsidian 18.0.52.3
OS version: AlmaLinux 8.7 x86_64
Build date: 2023/05/16 12:00
Revision: a3b74dbc9de2e47afd4e532d02fa7759b29d3fa5
PROBLEM DESCRIPTION
The SpamHaus RBL no longer accepts RBL DNS queries from any public resolver, including if you are using it as a forwarder. SpamHaus RBL is blocking all email if your server is using an open resolver. For example, public DNS resolvers like Google, Quad9, Cloudflare DNS or via any DNS server that is attempting a high volume of queries against SpamHaus without being registered with them. The mail logs will indicate the issue like this:
STEPS TO REPRODUCE
Set Tools and Settings -> Mail Server Settings -> DNS zones for DNSBL service to zen.spamhaus.org
ACTUAL RESULT
DNSBLs should work regardless of what DNS servers you are using.
EXPECTED RESULT
The average user doesn't know what public DNS resolvers are. All they know is that mail stops working once zen.spamhaus.org is set as a DNSBL.
ANY ADDITIONAL INFORMATION
How can I fix the error: Client host [XXX] blocked using zen.spamhaus.org; Error: open resolver; - Knowledgebase - Danami
YOUR EXPECTATIONS FROM PLESK SERVICE TEAM
Confirm bug
TITLE
Stop using zen.spamhaus.org as a DNSBL example on the Mail Server Settings page
PRODUCT, VERSION, OPERATING SYSTEM, ARCHITECTURE
Product version: Plesk Obsidian 18.0.52.3
OS version: AlmaLinux 8.7 x86_64
Build date: 2023/05/16 12:00
Revision: a3b74dbc9de2e47afd4e532d02fa7759b29d3fa5
PROBLEM DESCRIPTION
The SpamHaus RBL no longer accepts RBL DNS queries from any public resolver, including if you are using it as a forwarder. SpamHaus RBL is blocking all email if your server is using an open resolver. For example, public DNS resolvers like Google, Quad9, Cloudflare DNS or via any DNS server that is attempting a high volume of queries against SpamHaus without being registered with them. The mail logs will indicate the issue like this:
Code:
Client host [XXX.XXX.XXX.XXX] blocked using zen.spamhaus.org; Error: open resolver; https://www.spamhaus.org/returnc/pub/203.0.113.1
STEPS TO REPRODUCE
Set Tools and Settings -> Mail Server Settings -> DNS zones for DNSBL service to zen.spamhaus.org
ACTUAL RESULT
DNSBLs should work regardless of what DNS servers you are using.
EXPECTED RESULT
The average user doesn't know what public DNS resolvers are. All they know is that mail stops working once zen.spamhaus.org is set as a DNSBL.
ANY ADDITIONAL INFORMATION
How can I fix the error: Client host [XXX] blocked using zen.spamhaus.org; Error: open resolver; - Knowledgebase - Danami
YOUR EXPECTATIONS FROM PLESK SERVICE TEAM
Confirm bug