Thanks for the detailed response Martin, it does help to make things clearer.
Quote:
Originally Posted by eUK-Martin
No, we do not apply any filters other than that has been mentioned above.
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Just to be totally clear, (bad experience in the past!!), are you saying that the only settings on the servers that could affect our emails is :
The usual Spamassassin
The configuration that any emails that come from an IP address that is on the blacklist will be rejected.
Box Trapper.
Could there be anything else at
server level that might affect how we receive our emails please ?
Quote:
Originally Posted by eUK-Martin
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.
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The sooner SPF is used by everyone, the better really. DomainKeys seem to be catching on as well.
Quote:
Originally Posted by eUK-Martin
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
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Just wondering how many dynamic IP address's there are on those lists ! and how many IP address's of 'zombied' machines ! !
Martin, I did try to find a particular IP address on one of the above lists, but could only find a search function on list.dsbl.org - are there hidden-away lists to look at on any of the 4 above ?