Spam blocklist SORBS has been shut down, update Anti-Spam settings

[Barry de Graaff]

Copy/pasting a blog post just to make you aware of it, in case there are 
email delivery problems...


  Spam blocklist SORBS has been shut down, update Anti-Spam settings

The spam blocklist SORBS has been shut down. By default Zimbra uses 
SORBS via SpamAssasin, but also many Zimbra Administrators have set-up 
SORBS as part of Postfix MTA restrictions. Monitor the Zimbra MTA 
logging in //var/log/zimbra.log /and make changes to your configuration 
to make sure email continues to be delivered properly.


    Postfix reject_rbl_client

Check Zimbra’s MTA blocklist configuration by running the following 
command as the OS user /zimbra/:

zmprov gcf zimbraMtaRestriction


In the output of the command see if a line is present that contains 
sorbs such as /dnsbl.sorbs.net/ and if so remove it by running for example:

zmprov mcf -zimbraMtaRestriction “reject_rbl_client dnsbl.sorbs.net”
zmmtactl restart


    SpamAssassin

A future update of SpamAssassin in Zimbra will remove SORBS meanwhile 
since SORBS is on many places in SpamAssassin, one way to disable it is 
by adding the following configuration to your 
//opt/zimbra/data/spamassassin/localrules/local.cf/ file.

dns_query_restriction deny sorbs.net


Then as the OS user /zimbra/ run the commands:

zmmtactl restart && zmamavisdctl restart


*Please note that the SpamAssassin steps have not been validated by our 
QA team yet, so keep an eye out for updates on this blog post at 
blog.zimbra.com.*


    Further reading

An official announcement can not be found on the SORBS website, but we 
can see it has been removed from SpamAssassin in:

  * https://github.com/search?q=repo%3Aapache%2Fspamassassin+sorbs&type=commits
    <https://github.com/search?q=repo%3Aapache%2Fspamassassin+sorbs&type=commits>
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