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Hi Team, 
 
We are running our own mail server (postfix/dovecot) and we are severely hit by spam lately. The spam is 
especially directed to one particular email address. 
 
We have installed spamassassin and let the score to be the default (5). However, most of the spam 
messages's score is calculated much below 5, and thus spamassasin is not tagging them as spam. 
 
e.g: 
 
X-Spam-Level: * 
X-Spam-Status: No, score=1.9 required=5.0 tests=HTML_MESSAGE,RP_MATCHES_RCVD, 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SPF_HELO_PASS,SPF_PASS,T_REMOTE_IMAGE,URIBL_BLOCKED,URIBL_DBL_SPAM 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;autolearn=no version=3.3.2 
Thread-Index: AQDk/HpmbBSNJI1pQg3Hg8cGEtwSMA== 
Content-Language: en-us 
 
We also installed amavisd, agents like pyzor, razor and installed dcc too. Inspite of this, we 
still get lot of spam which is not detected as spam by spamassassin. Is spamassassin miscalculating? 
What else can I do to stop the spam? 
 
 
Thanks.
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Hi Team,

We are running our own mail server (postfix/dovecot) and we are severely hit by spam lately. The spam is
especially directed to one particular email address.

We have installed spamassassin and let the score to be the default (5). However, most of the spam
messages's score is calculated much below 5, and thus spamassasin is not tagging them as spam.

e.g:

X-Spam-Level: *
X-Spam-Status: No, score=1.9 required=5.0 tests=HTML_MESSAGE,RP_MATCHES_RCVD,
	SPF_HELO_PASS,SPF_PASS,T_REMOTE_IMAGE,URIBL_BLOCKED,URIBL_DBL_SPAM
	autolearn=no version=3.3.2
Thread-Index: AQDk/HpmbBSNJI1pQg3Hg8cGEtwSMA==
Content-Language: en-us

We also installed amavisd, agents like pyzor, razor and installed dcc too. Inspite of this, we
still get lot of spam which is not detected as spam by spamassassin. Is spamassassin miscalculating?
What else can I do to stop the spam?


Thanks.

Stopping spam on postfix mail server.

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.

AntiSpam

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.