The tag has no wiki summary.

learn more… | top users | synonyms

30
votes
6answers
45k views

How to send emails and avoid them being classified as spam

This is a canonical question about how to handle email sent from your server being misclassified as spam. For additional information you may find these similar questions helpful: Best ...
20
votes
4answers
4k views

Best Practices for preventing you from looking like a spammer [duplicate]

I'd like to feel more confident setting up mail for my clients with regards to false positives. Here's what I know: SPF records are good, but not every spam filter service/software (SFSS) uses ...
10
votes
1answer
1k views

How to configure amavisd-new for only scanning on particular senders/servers?

I'd like to know how to configure amavisd-new to only scan for Spam on particular clients (IPs, CIDRs or hostnames) or alternatively sender's email domain. I know that it is possible to do it on a ...
7
votes
2answers
2k views

GMail suspects confirmation email in stealing personal information

When user registers on my web site, web site sends user email confirmation link. Subject: Please confirm your email address Body:Please open this link in your browser to confirm your email address: ...
5
votes
2answers
450 views

97% of emails reaching IronPort/Domino are Spam

We have a Domino mail server protected by Iron Port (v7.1.5 I think). Iron Port reports an average 96%-97% of emails are stopped by reputation filtering, and around 3% of emails are clean messages. ...
5
votes
2answers
8k views

Optimal parameters set for Postfix “smtpd_recipient_restrictions”

we've inherited the DNS from another ISP and now our mail server is bombed by about 1000 emails per minute, 99.99% of these emails are just spam. We're trying to optimize the filtering/rejecting the ...
5
votes
3answers
4k views

Why does gmail flag my server emails as spam?

I recently moved my server to a new slice at slicehost and since, gmail has been flagging my email as spam. I have added domain keys, created a SPF record, have reverse dns setup, and my ip is not ...
5
votes
3answers
702 views

How to modify a message, so it will be for 100% recognizable as spam by Exchange junk e-mail filter

I have an sendmail server, sitting in front of my Exchange server. This server filters spam with SpamAssassin (and does it incredibly well!), but it merely tags spam messages with appropriate header ...
4
votes
2answers
2k views

Postfix: content-filter vs. milter

I have a Postfix mailserver with content filtering using AMaViS via the "content-filter" option of Postfix. Now I wonder whether it would be better to use AMaViS as a milter instead of the ...
4
votes
2answers
1k views

Barracuda tagging email with 'date grossly in the future.'

I have a Barracuda 300. Granted it's running on some old firmware and the Energize updates are quite outdated. I'd like to update them, but, not my financial decision to do so. Starting around the ...
3
votes
4answers
437 views

Hosted Anti-Spam Service vs. Anti-Spam Appliance

We're currently using Content Catcher, a hosted spam solution. For less than what we pay them per year, we could purchase an anti-spam appliance to run in house. From a simple dollar perspective, it ...
3
votes
3answers
152 views

Do mail servers and/or spam filters care about a domain's root A record?

I have a domain which I only use for email adresses. I don't host any content there. My provider added an initial A record at the root of my domain which points to a server that delivers a ...
3
votes
8answers
2k views

Block spam by using geoip filter?

We are looking for a way to be able to block spam based on geographic location by filtering using geoip. context: we rarely have any email correspondence outside of the USA, so we would like to block ...
3
votes
2answers
12k views

Allow email from a particular sender through spam filter

We are running exchange 2010 and are using the built in anti-spam feature. We have set up Content Filtering, IP Block List Providers, Sender ID, Sender Reputation and it filters out most of the junk ...
3
votes
2answers
2k views

Bayesian filtering for Exchange 2010

So here's the deal. Basically, I am looking for a convenient way to get spam from my Exchange 2010 mail server to my spam filter/proxy (whatever you want to call it) in a mail format for ...
3
votes
2answers
108 views

Postfix - forward rejected by unknown recepients emails to SPAM-learning mailbox

I have Postfix + BitDefender FRAMS running as hygiene gateway before few Exchanges. BD FRAMS can learn it's Baesian filter by download SPAM and HAM emails from dedicated mailboxes. Because we have ...
3
votes
2answers
3k views

Recommended way to implement Postfix 'before-queue' SpamAssassin filtering?

After some discussions with colleagues and the relevant depts. in my office, I have come to the conclusion that for my Postfix server, I must implement a 'before-queue' filtering. The reason is that ...
3
votes
4answers
8k views

Message Queue building on Barracuda Spam Firewall

I have just installed our new Spam Firewall, and all seemed well. But the Spam Firewall has now decided to put all mail in a message queue and I have no idea how to force it on or anything as there ...
3
votes
1answer
356 views

How can I explain to dspam that the user “brandon” is the same as “brandon@mydomain”

I am using dspam for spam filtering by running the "dspamd" daemon under Ubuntu 9.10 and then setting up a Postfix rule that says: smtpd_recipient_restrictions = ... check_client_access ...
3
votes
1answer
441 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
4answers
2k views

Best practices for spam filtering

I've been running an amavisd-new, spamassassin, postfix setup for a while to help crush spam on our incoming e-mail servers. The setup I'm using is a few years old at this point and its about time to ...
2
votes
5answers
4k views

What's a good alternative to the Barracuda Spam Appliance? [closed]

Searching for Barracuda alternatives didn't yield much. Can anyone recommend a good spam appliance like Barracuda? I want something that will strip bad stuff out like if I have a .txt attachment ...
2
votes
5answers
5k views

Open Source or lower-cost alternatives to Barracuda Spam Filter

I'm aware of SpamAssassin-based solutions, but I'm looking for a free or low(er) cost spam filtering solution that's similar in functionality to the Barracuda Spam Filter. The Barracuda works well, ...
2
votes
6answers
359 views

I'm hosting reseller and I got spam problems. Please help to solve

Our provider suspended our account with 5000+ clients and their sites. The reason was that the whole IP range was blacklisted by SpamHouse, but our provider did not explain what emails, form what IP ...
2
votes
2answers
175 views

Best techniques to make sure that emails are not marked as spam

We have a service that requires a registration and the registration process sends some confirmation emails. These emails say in a three-line message that you have to click some link with a generated ...
2
votes
3answers
814 views

How do you configure sendmail to reject Email with a Date header too far from real time?

A friend of mine using (I believe) qmail has it configured to reject, as SPAM, any incoming Email with a Date: header that is too far from real time. I can't figure out how to do this with sendmail. ...
2
votes
1answer
131 views

Outgoing emails from China based VPS rejected or marked as spam

I just switched email service provider from Google apps to a VPS with a Hong Kong host. Now I find a huge part of all outgoing emails ending up in spam boxes and in some cases getting totally rejected ...
2
votes
4answers
220 views

Does sending e-mail in the name of customers increase the risk of being marked as spammer?

We are developing a SaaS website application that lets users send invoices to their clients. Ideally, these e-mails should appear to be originating from our customers, so the sender e-mail address ...
2
votes
1answer
3k views

Is there any way to see why Outlook's client junk mail filter is marking a message as spam?

I have some users running Outlook 2007 connected to an Exchange server, and they're complaining about mail ending up in their junk box. There's no X-SCL tag in the mail headers so this filtering must ...
2
votes
1answer
2k views

Is there any way to prevent Excel 2007/2010 from including .bin files in saved .xlsx files?

In case anyone isn't aware, the new Office 2007/2010 files are actually a type of archive file. Since deploying some recent (ish) Microsoft updates to our client machines, we've been getting lots of ...
2
votes
5answers
937 views

How to configure email server to send lots of transactional emails

My organization is currently outsourcing email delivery to an SMTP service provider. We're considering bringing that back in house to deliver our own emails. We send about 5k transaction emails per ...
2
votes
2answers
1k views

How do I allow end user 'blocked sender lists' to work even if the server manages spam filtering?

Client filtering in Outlook 2010 is disabled when the server is managing spam filtering. Unfortunately I have a few high profile users that prefer to spam-block mailing lists rather than unsubscribe, ...
2
votes
2answers
437 views

Outbound business email being marked as spam in other organizations

Wanting to make sure I've done everything I can to prevent our legitimate email from being incorrectly marked as spam by other companies: Exchange 2010 with SP1, no major changes in 6 months. I've ...
2
votes
1answer
373 views

Desperation: All FIVE of my Postini clients' accounts have been deactivated

Note: This is re-telling of a message I just posted to Google's support forums. Well, this week has not been good. I have five clients on Postini. All of the clients accounts were purchased ...
2
votes
1answer
1k views

Setting up a Barracuda Spam Filter

We have just purchased a Barracuda Spam Firewall 300, we have set it up but are having problems authenticating with our Exchange server (2007). I spoke to Barracuda about it and they said I need to ...
2
votes
3answers
9k views

Outlook - Junk Email - Add an email to the safe senders for entire company?

We've got an internal web based system that emails out reports on a regular basis. The emails are sent as: internalsystem@thecompanyIworkfor.com and the body of the email has a bunch of data and some ...
2
votes
2answers
2k views

How does Outlook 2007 decide if it should redirect an e-mail to the Junk E-mail folder? [duplicate]

Possible Duplicate: Is there any way to see why Outlook's client junk mail filter is marking a message as spam? My Question: How does Outlook 2007 decide if it should redirect an ...
2
votes
0answers
364 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 ...
2
votes
1answer
54 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
vote
2answers
10k views

How do I find out what a Spam Custom Rule is?

We use a Barracuda Spam Filter at work, and we also provide a mass emailing program to some of clients that send out newsletters. Lately one of them's been composing his latest company newsletter and ...
1
vote
3answers
305 views

Are generic reverse DNS entries acceptable for an outgoing SMTP server?

Our PTR records are managed by our ISP, as our ranges are too small for them to consider delegating to us. So, every time I want to update an entry, I have to email their support team. In an effort ...
1
vote
4answers
5k views

Filtering spam to an IMAP folder with postfix, policyd and amavis?

Using amavisd-new, I'm successfully marking multiple headers and accurately reporting most spam. However, right now I'm delivering it to the inbox and I would like to have a Junk folder instead. ...
1
vote
5answers
489 views

DNSBL - Email Servers Spam

I'm currently doing research on a better way for emailing customers our news letter and not using an ESP such as vertical response since most users there use purchase list and ruin the shared IPs for ...
1
vote
2answers
168 views

How Reverse DNS does what it does

Hopefully this is not a stupid question, but I cannot find a clear cut answer. Can someone please inform me exactly what 'source address' is used in Reverse DNS? Does rDNS pull the IP address from ...
1
vote
3answers
242 views

How to prevent Linux server from spamming?

I installed mail scanner for spam protection, but is there any script for Linux to notify me or email me that some one spaming on my server ?
1
vote
2answers
162 views

would this header cause the email to be flagged as suspect?

Authentication-Results: [snip].mail.[snip].[snip].com from=someDomain.com; domainkeys=neutral (no sig); from=someDomain.com; dkim=neutral (no sig) Received: from 127.0.0.1 (EHLO ...
1
vote
2answers
1k views

Configure postfix to filter email into hold queue

I would like postfix to send all emails received on SMTP off to an external process, which will decide whether to allow them through as normal, or whether to put them into the hold queue (or another ...
1
vote
1answer
299 views

Where/How Can Spam False Positives Be Reported To MessageLabs?

An email I sent got flagged as spam by MessageLabs on the recipient side. I'd like to proactively engage MessageLabs to tell me more about why this got quarantined (or at least fix it). Is there ...
1
vote
3answers
280 views

Exchange 2007 ineffective spam filter

On a pretty clean 2007 setup, I'm seeing A LOT of mail with senders such as 0.0011a7f8@roman htyme@14009d3cb93848c 0-lz@14009d3cb93848c 0-5-1@home-4fd909062d 0-td@h109-187-48-125.dyn.bashtel.ru all ...
1
vote
2answers
1k views

How can I filter spam from yahoo's servers?

In the last few months my mail server has been getting massive amounts of spam from yahoo.com's mail servers. Each one appears to be from a different Yahoo mail free account. The spam is all coming ...