Tomas Kuliavas wrote:

Hi again Tomas. Thanks for the help.

>> SquirrelMail 1.4.6
>> PHP 4.4.1
>> UWIMAPD (IMAP4rev1 2003.339p-cpanel)
>> Apache 1.3.34
>> CentOS 4.2 i686
>> Our webserver runs as nobody.
>>
>> Many of my recipients don't receive my messages, sent from SquirrelMail,
>> because my messages end up in their spam folders or are filtered out by
>> their ISP or employer as spam. Why does this happen so often with
>> SquirrelMail-sent messages?
>>
>> I know about the "bug" in one version of Spam Assassin, that mistakently
>> assigns messages sent by SquirrelMail with a higher spam score than is
>> warranted.
>>
>> I also have some recipients who find that my messages end up flagged in
>> the subject line with "Bayesian Filter detected spam". With some such
>> recipients, an initial message makes it through cleanly, but if I reply
>> to
>> their message then it will be flagged "Bayesian Filter detected spam".
>>
>> With some other recipients it's unclear what spam filtering is in place,
>> but my messages always end up in their spam folder.
>>
>> Yes, users should check their spam folders. But, some users aren't clued
>> in enough to remember to do that. From a non-informed user perspective,
>> it
>> would be better if we SM administrators could do something to minimize
>> the
>> chances that our mail is flagged or blocked as spam.
>>
>> What causes so many SquirrelMail-sent messages to be flagged as spam? Is
>> there anything we can do about it?
>
> Bayes is trained spam detection engine. If users misuse it or train it
> incorrectly....

I agree. However, the recipients affected by this are not the ones who
administer the spam detection. Their ISP or employer is marking my
messages as spam.

> If users send emails from broadband addresses, some spam filtering engines
> might check ip address in first Received header and assign extra points
> when address is listed in DUL RBL.

Do you mean my ISP connection IP? I do use broadband (DSL) as my ISP
connection. Is there somewhere I can lookup addresses on DUL RBL? I
Googled but didn't find a list or query form.

> If you have server on DSL connection,
> filters can check second received header.

No, I don't run a local server. My web server (which runs SM) is in the
Pegasus/Fortress ITX datacentre in New Jersey. It's a shared hosting web
server, so I am not the only account on it.

> SquirrelMail 1.4.6 allows to
> hide user's ip address. Two different options are available. One option is
> in 4. General options section and another is in SMTP/Sendmail options.

Sorry, I don't see those options. I use the Administrator plugin in 1.4.6.
Here are the options displayed in those two sections:

(-) Server Settings
Mail Domain
IMAP Server Address  127.0.0.1
IMAP Server Port  143
IMAP Server Type University of Washington's IMAP server
IMAP Folder Delimiter    /
Use TLS for IMAP Connections No   Requires PHP 4.3.x! Experimental.
IMAP Authentication Type IMAP
Use Sendmail Binary No   Choose "no" for SMTP
Sendmail Path
SMTP Server Address  127.0.0.1
SMTP Server Port  25
Use TLS for SMTP Connections No   Requires PHP 4.3.x! Experimental.
SMTP Authentication Type   No SMTP authLogin
POP3 Before SMTP?  No
Header Encryption Key
Invert Time


(-) General Options
Data Directory
Temp Directory
Hash Level Hash Disabled
Default Left Size
Usernames in Lowercase YesNo
Allow use of priority YesNo
Hide SM attributions YesNo
Enable use of delivery receipts YesNo
Allow editing of identities YesNo
Allow editing of full name YesNo
Remove username from headers YesNo   Used only when identities can't be
modified
Use server-side sorting YesNo
Use server-side thread sorting YesNo
Allow server charset search YesNo
UID support


> If you use sendmail (http://www.sendmail.org) and SquirrelMail is
> configured to use /usr/sbin/sendmail, sendmail can add extra headers about
> untrusted senders. These headers can trigger spam filters too.

I use SMTP.

> Are you sure that X-AntiAbuse headers are added to all email users? If
> they are present only in SquirrelMail emails, headers might trigger some
> filtering engines too.

I just checked Outlook, which I use occasionally if my SM server is down,
and its headers do not include X-AntiAbuse.

I'd like to do what I can to decrease the odds of my mail being blocked by
spam filters. The recipients who are affected by this aren't technically
savvy, so they can't provide much help other than to say that my mails
don't arrive or end up in spam folders.








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