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Originally Posted by _Chris_
Hi Martin, Thanks for the quick response. There's no specific domains, and perhaps this is something that other customers may be interested in learning more about, but generally, are there any filters that you are applying, that your customers wouldn't know about ?
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No, we do not apply any filters other than that has been mentioned above.
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Originally Posted by _Chris_
Also, quite a few spammers nowadays use other peoples email address's as the 'from' address so sometimes other people have their email address's on blacklists because of that, what blacklists do you refer to please?
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Using other peoples domain in the spam emails is called spoofing and this can be avoided but having an SPF record in the DNS zone of the domain. But this will be only work if the receiving email server checks the acceptance of SPF record. cPanel by default does not have this feature enabled, it requires recompiling of exim. And the reason for that is most of the domain does not have this record in their DNS zone so incase we enable this all the emails from such domains will be rejected. However we do add an SPF record in the DNS for all the domains on our server.
Your third point about the email address getting black listed, many people have this misunderstanding about the black listing. It is not the email address that gets black listed but the IP address from where the email was generated. So even if the spammer is using your domain in the header it will not black list your domain but the IP address of the server that is generating the mails.
We use following Black Lists:
bl.spamcop.net
sbl.spamhaus.org
list.dsbl.org
cbl.abuseat.org