You can add per-domain AV and Spam filtering support, if you wish. Just follow the following steps:

1.) open up /usr/local/atmail/mailserver/configure

2.) find:

MYSQL_DOMAINS = select Hostname from Domains where Hostname='${quote_mysql:$domain}'

3.) Below this, add:

MYSQL_AVCHECK = SELECT Hostname from Domains where AV='1' and Hostname='$domain'

MYSQL_SPAMCHECK = SELECT Hostname from Domains where Spam='1' and Hostname='$domain'

4.) Then, find this line:

domainlist relay_to_domains =

5.) Below this:

domainlist sa_domains = mysql;MYSQL_SPAMCHECK
domainlist av_domains = mysql;MYSQL_AVCHECK

6.) Then, find:

accept  hosts = :

7.) Below this:

warn domains = +av_domains
set acl_m1 = 1

warn domains = +sa_domains
set acl_m2 = 1

8.) Then, find:

acl_check_content:

9.) Below this, add:

accept condition = ${if match{$acl_m1}{1}}

accept condition = ${if match{$acl_m2}{1}}

10.) Login to your MySQL

11.) Add the two other columns to the Domains table:

> alter table Domains add Spam tinyint(1) default NULL;
> alter table Domains add AV tinyint(1) default NULL;

12.) To enable filtering for a specific domain, do the following:

> update Domains set Spam='1' where Hostname='yourdomain.com';

Replace yourdomain.com with your chosen domain.

13.) Restart atmail:

% /etc/init.d/atmailserver restart

Under a fresh installation of RedHat Fedora Core3 ( FC3 ) , a compile of the Clam/@Mail Anti-virus daemon can fail with the following:

gcc: /usr/lib/libidn.so: No such file or directory
make[2]: *** [libclamav.la] Error 1
make[2]: Leaving directory `/usr/local/atmail/webmail/libs/src/clamav/libclamav'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory

root# ln -s /usr/lib/libidn.so.11.4.6 /usr/lib/libidn.so

ClamAV, at times, fails and puts mail delivery and the processing of emails in the spool to a stop. This can be avoided by using ClamAV with supervise, a Unix tool that comes with the daemontools (http://cr.yp.to/daemontools.html) package, which basically checks if a service is running, then re-runs it if found inactive.
Implementing supervise with ClamAV is pretty straightforward. Just go through the following steps:

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When you want to upgrade SpamAssassin 2.63 for @Mail to 3.0, keep in mind that the two versions have different SQL querying schemas. Also, you may need to take out some lines in the local.cf file, as many options have been deprecated.To upgrade your SpamAssassin installation, just run through the following steps:

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Should you want to see if your Spam filter is working, just send an email with the following string:

XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X

This is the GTUBE - the Generic Test for Unsolicited Bulk Email. If your spam filter supports it, the GTUBE provides a test by which you can verify that the filter is installed correctly and is detecting incoming spam, in a similar fashion to the EICAR anti-virus test file.

Question:We are using @Mail in the mail-server mode with the AV scanner. We'd like all incoming messages that are clean via the AV scanner to append a header "X-Virus-Scanned: Clean" to each message in the users mailbox.

Answer:This is possible by editing the transport router in Exim to append the new header for each incoming message.

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Should you want to disable SpamAssassin for some domains or users, just do the following:- open up your /usr/local/atmail/mailserver/configure
- find the following lines:

domains = ${lookup mysql {MYSQL_CHECKSPAM}{$value}}

- replace this with:

domains = lsearch;/usr/local/atmail/mailserver/domains

- create a file /usr/local/atmail/mailserver/domains, and put your desired domains to enable SpamAssassin with, in the following format:

domain1.com
domain2.com

- restart Exim:

% /etc/init.d/atmailserver restart

This will then limit the SpamAssassin filtering to the users in the domains listed.

If you receive the SMTP error:

"550 Virus Oversized.Zip detected. Mail delivery avoided"

This is due to the ClamAV engine of Atmail scanning a message attachment and the zip file compression ratio is too high. For example, zipping a large number of BMP files with high compression.

This feature is implemented in Clam to avoid a special crafted Zip file to loop on extraction causing a denial-of-service attempt.

To change the compression ratio simply edit: /usr/local/atmail/av/etc/clamd.conf

# If a file in an archive is compressed more than ArchiveMaxCompressionRatio
# times it will be marked as a virus (Oversized.ArchiveType, e.g. Oversized.Zip)
# Value of 0 disables the limit.
# Default: 250
ArchiveMaxCompressionRatio 0

Specify 0 to disable, or increase the ratio above the default 250, then restart the Atmail services.

Question:Our need is to block all email addresses/domain not configured in the @mail server.
So I want to avoid mail deliveries from addresses like bill.gates@microsoft.com or george.bush@whitehouse.org.

Answer:Yes this can be done. Follow the step detailed below.
Open and edit the Exim configuration file located at /usr/local/atmail/mailserver/configure, please remember to also back up this file before changes are made. Find and delete the following code.

# This router routes addresses that are not in local domains by doing a DNS
# lookup on the domain name.
dnslookup:
driver = dnslookup
domains = ! +local_domains
transport = remote_smtp
ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8
no_more

Restart the @mail server and test.