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2answers
74 views

Users accessing our email when traveling overseas are seeing strange SPAM behavior

I run technology for an international non-profit, so I have users that could be checking their email from Pennsylvania one day, Santo Domingo the next, and Kabul, Afghanistan, the next week. Recently, ...
1
vote
2answers
281 views

Why are default spamassassin rules not being applied to emails we generate?

My company uses a standalone spam-assassin install to test marketing emails, however, mail originating from us does not seem to run the full gamut of test. For example, Spam assassin has a default ...
4
votes
1answer
734 views

How to edit bad word filter in SpamAssassin?

How can I add several custom "bad" words into SpamAssassin, so emails that contains that words are marked as a spam? UPDATE one of the keys is to edit file /etc/mail/spamassassin, and to add badword ...
2
votes
1answer
59 views

Exchange 2013 IPBlockListProvider blocking some (but not all) matched IPs

I have configured our Exchange 2013 Edge Transport server to utilize several IPBlockListProviders including Spamhaus. While they work great most of the time, there are still some emails which despite ...
2
votes
1answer
71 views

Training a spam filter based on Mailman moderator's actions?

I'm planning a Mailman server, and looking for a good way to enable list moderators train a spam filter (likely to be either spamassassin or dspam). Has anyone come up with a good way to run training ...
1
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1answer
133 views

postfix header_checks - regex spanning multiple lines

I would like to create a spam filter that spans multiple lines in headers. This is my /etc/postfix/header_checks file: /^From:.*name[0-9]+@.+[\r\n]+To:.*name@domain\.com/ REJECT It's a valid ...
1
vote
1answer
33 views

Remove spoofing email notifications

I am using CentOS release 6.5 (Final) with MIMEdefang and I am getting spammed by someone that uses an e-mail spoofer. He sends alot of e-mails from random-user@mydomain to the same ...
0
votes
1answer
7 views

sbs 2008 exchange 2007 recipient filtering

We have an SBS 2008 server with exchange 2007 installed on it. We run a spamfilter in front of it. My problem is that whenever I use an invalid email address. invalid@mydomain.com it gets accepted by ...
0
votes
1answer
136 views

Sieve - Redirect incoming mail for all mailboxes within domain to one specific mailbox

Is it possible to set a global sieve filter to redirect mail to specific mailbox within receiving domain. I understand I can simply point out where I want mail to go in a filter like ...
0
votes
1answer
274 views

How to Block Web Crawler from Downloading File

Is it possible to block web crawler from downloading files (like zip file) in my server? I supposed to create a PHP script using cookies to track visitors specially web crawlers to login/register ...
0
votes
1answer
515 views

Built in spam filters SBS2008

I have an sbs 2008 server with exchange 2007, its running the MS spam filters which picks up the spam fine, however a lot of senders cannot send email to the recipients of the sbs2008 server until ...
2
votes
0answers
379 views

Exchange 2007 delivering messages flagged as SPAM

I have an SBS 2008 box running Exchange 2007. Mail is delivered directly to the Exchange machine from the Internet via a receive connector (I have already advised people that it would be better to use ...
0
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0answers
37 views

Lotus Domino how to Enable Verify connecting hostname in DNS but with exception

Hi I enabled @ LOtus Domino the Configuration -> Message Settings -> SMTP Inbound Controls Verify connecting hostname in DNS This blocks all messages incoming if the sender IP has no reverse dns. ...
0
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0answers
29 views

SCL not available for single user

Recently migrated from Exchange 2003 to Exchange 2010 with Edge server. Problem is: All incoming mail for one specific user bypassing Mail Content Agent checks, there is a record from logs: ...
0
votes
0answers
76 views

How to better block phishing spam due to heartbleed?

I imagine it won't take long for spammers to recognize that Heartbleed is an ideal way to do phishing. I am thinking of ways to mitigate the phishing risk, I mean just this time for the heartbleed ...
0
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0answers
365 views

Quickly Filtering Blocks of IP Addresses

I had to black list some IPs that were coming from Russia from accessing my site. (Malicious bots kept taking my server down.) I created a text file that I loaded into RAM which contains /8, /16, /32, ...
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votes
0answers
25 views

How to properly prevent listing in Spamhouse / CBL with the postfix MTA?

There is a server on a public IP address that acts as a webserver, thus websites can send and receive e-mail thru it, and clients/users can also connect directly with IMAPS, POP3S, and SMTPS and use ...