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Questions tagged [spam-filter]

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Looking for explanation how SpamAssassin communicates with mail server

Our server runs Exim for MTA and we also installed and activated SpamAssassin under DirectAdmin for all users and mailboxes. Most of our users use Gmail or Apple mail to access the server's mailboxes ...
pavaros's user avatar
0 votes
0 answers
104 views

Mail signature invalid because of encoding of dots in quoted-printable mail

This is a repost so i will link the post: https://security.stackexchange.com/q/274208/227343 I‘m sending a mail encoded with quoted printable encoding that contains some dots „.“. There is a problem ...
Lorem ipsum's user avatar
0 votes
1 answer
109 views

Different spam filter method for sasl-auth clients?

Using a standard Ubuntu postfix setup (Ubuntu 22.04), I would like to filter mail as follows: Incoming submission and smtps (the vast majority of mail): SPF and RBL checks (I'm using policyd.pl), ...
TommyPeanuts's user avatar
-2 votes
1 answer
60 views

Spam filters: IP address with no history v. good history [closed]

Zoho gave me an IP address with no history this week. Senderscore.org says there's insufficient data to evaluate it. At other times Zoho has assigned me an email sending IP with a fair or good score. ...
DNSnoob's user avatar
0 votes
1 answer
74 views

Spamassassin How to stop domain email containing only numbers?

There are more and more spams coming from domain containing only number like 23821.com. You can see an example in the message header below. Received: from hmdablm ([116.186.123.166]) by 23821.com with ...
PatriceJ's user avatar
0 votes
1 answer
125 views

Sign-Up verification emails going to spam despite proper authentication

I am using SendGrid to relay emails sent via Drupal. I am struggling with Gmail specifically marking Sign-Up verification emails as spam despite using DKIM, DMARC, SPF, reverse DNS, everything there ...
MultiformeIngegno's user avatar
0 votes
0 answers
75 views

Multi-message anti-SPAM filter in SpamAssassin

My vendor's database has been stolen and I started to receive spam messages in a huge amount. It is being sent by spambots / spam scripts, so sender and recipient email addresses are always fake. The ...
trejder's user avatar
  • 163
0 votes
1 answer
635 views

Spamassassin not scoring correctly

I have Spamassassin running on a Ubuntu/Plesk server. It was working relatively well until recently but now seems to be letting through random spam messages. These messages seem to trigger plenty of ...
Chris Leather's user avatar
1 vote
0 answers
134 views

Include matching rspamd rules in mail headers

Spamassassin has a feature to include the matching rules in the headers of mails flagged as spam, so one can see why the mail was classified as spam and possibly adjust or create mailbox filters that ...
allo's user avatar
  • 1,733
0 votes
2 answers
106 views

Is an email server that accepts an email and then silently filters it out complying with SMTP standards?

Can you send an email to an address, have it be accepted by the mail server, and then the mail server silently deletes it? I am running an email server. I have noticed that some emails come from IP ...
AJP's user avatar
  • 155
1 vote
1 answer
371 views

How to whitelist our own outgoing emails from being blocked in amavis/spamassassin using Spamhaus' block lists?

Just after we implemented spam filtering on our Postfix server using spamassassin-dqs through amavisd-new we drastically reduced received spam, but to our surprise our own outgoing e-mails are being ...
Claudio's user avatar
  • 179
1 vote
0 answers
371 views

Email Sieve to Target emails with a specific pattern in a catchall domain address

I have the following email formats: [email protected] [email protected] [email protected] [email protected] I create them on the fly when I sign up to different sites. I'm having an ...
Patoshi パトシ's user avatar
2 votes
1 answer
4k views

DMARC record is valid, but your domain's None/Quarantine policy does not yet protect it against email spoofing and phishing

People, Using the website: https://easydmarc.com/tools/dmarc-lookup?domain=name.com I got this error: DMARC record is valid, but your domain's None/Quarantine policy does not yet protect it against ...
Senior Systems Engineer's user avatar
0 votes
3 answers
2k views

Any way to bypass Barracuda spam filter for specific addresses?

We are a medium-sized company planning to switch our spam filter service. Right now, our computing solution provider hosts a Barracuda service on its server. Our emails are routed there and filtered ...
SenseiRalph's user avatar
0 votes
1 answer
158 views

Postfix - Eliminate sender domain based on recipient email address

Does anyone know of a way, using Postfix, to block a domain as soon as it tries to send to a specific recipient address? Spam typically goes to several recipients in my organization. Some email ...
MindSpiker's user avatar
0 votes
1 answer
144 views

Antispam Exchange Online Permission Error

We have Office 365 Accounts and also an Microsoft hostet Exchange online Server. Normaly i could manage my antispam Rules and Policys in the Exchange Admin Center. A few months ago there was the new ...
ahdgfd's user avatar
  • 139
2 votes
2 answers
830 views

body_checks: How to filter base64 encoded content?

The idiomatic answer is probably "don't - use a filter that decodes the message first", but as can be seen in the second answer to that question, it should also be possible with body_checks ...
Ted Lyngmo's user avatar
1 vote
1 answer
486 views

Postfix no longer rejecting emails based on spam block lists

My postfix server is configured to reject emails based on a couple of spam block lists administered by spamhaus and spamcop. After noticing that I've been receiving more spam than normal recently, I'...
Darren's user avatar
  • 335
1 vote
0 answers
107 views

spamassasin unable to read Japanese when it is html encoded

I would like to block some emails which contains certain Japanese words, but spamassassin fails to detect such words when the email is HTML encoded, for example: This is a multi-part message in MIME ...
lepe's user avatar
  • 469
1 vote
0 answers
150 views

Continuous SPAM from certain IP/s hosting provider, how to report them if not responding at [email protected]

last maybe 4 weeks is coming SPAM e-mails from various domains. In common is that when i paste the source code of the e-mail to https://www.spamcop.net is detected this provider and their mailbox: ...
16851556's user avatar
  • 506
1 vote
1 answer
303 views

How to minimize chances of one's domain being falsely blacklisted (uribl)

My side job is to admin my wife's company domain. It's only used as a domain name for Google mail and tools (slides, docs, etc...). Although she used her domain for email for many years without any ...
Jeffrey's user avatar
  • 113
0 votes
0 answers
202 views

eMails sent from G-Suite go to Spam in Gmail clients. IP and Domain not blacklisted

We are running a platform with + 1 Mio users who sign-up with double opt-in to nurture them and allow them to be notified etc. All notifications by email are using our main domain (example.com) that ...
Andreas von Estorff's user avatar
0 votes
1 answer
69 views

Is it ok (regarding spam) to use yahoo to send email from our domain [email protected]?

I m enough of seeing my email arriving in spam folder. I would like now to send my emails not from my smtp server but from yahoo mail server. When you have a yahoo account, you can choose to send ...
zeus's user avatar
  • 133
0 votes
0 answers
684 views

Enabling X-Spam-Report in SpamAssassin

I tried to enable header X-Spam-Report in local.cf: report_safe 0 Per instructions this should cause adding this header to emails. Yet the header is not there. How can I fix that?
LetMeSOThat4U's user avatar
-1 votes
1 answer
62 views

How is it possible for spammers to keep pestering me with FAKE domains when all e-mail sending providers have these insane obstacles to go through?

I keep getting e-mails to my Gmail account from made-up domains such as: @mtixusu9shbyusyr6.org.uk @mpqyriexqpvramtkn.org.uk And so on... (Yes, I checked some of them and they are not actually ...
L. Marron's user avatar
0 votes
1 answer
680 views

Can I disable spam filtering for one user in Exchange Online Protecttion?

We are using Exchange Online Protection in front of our on-premises mailserver. Is it possible to disable the spam filtering for one user only?
madcap's user avatar
  • 55
-1 votes
1 answer
198 views

Mail Server IP address is getting blocked by Spamhause

I have use my mail server public IP address for years. But now it is blocked by spamhause. But no special no illegal activities happened on my network. We have very good monitoring solutions and no ...
serverAdmin123's user avatar
0 votes
1 answer
38 views

Exchange/ePrism quarantine settings

I'm temporarily overseeing the company's infrastructure while we find a replacement for someone who recently left. We have on-premise exchange with ePrism (EdgeWave). Most of our users find our email ...
d0001's user avatar
  • 329
5 votes
2 answers
15k views

Spam passing postfix config "hostname does not resolve to address: No address associated with hostname"

On a postfix MTA MX setup, I have a spam mail pass two checks which it definitely shouldn't. The postfix/smtpd process logs these warnings, which should be a hard fail in this setup: hostname * does ...
nyov's user avatar
  • 359
1 vote
2 answers
2k views

Postfix's header checks not working as expected

This question continues from this identical but focuses on another aspect of detail: the Postfix testing tool and the different options. As the OP of the linked question, to prevent spam, and ...
usr-local-ΕΨΗΕΛΩΝ's user avatar
0 votes
1 answer
52 views

why two spam policy apply on the same email

Recently, we made some Spam setting as below shown, but don't know why the result is, emails are prepended with 'spam' and move to junk mailbox at the same time. We want SCL 5 emails is prepended with ...
thomasnli's user avatar
1 vote
1 answer
771 views

Gmail detects emails as spam from domain with neutral reputation

I have a new domain and mail-in-a-box server set up correctly. Unfortunately, when sending to Gmail, it treats emails from my domain a a spam. The domain is not blacklisted and DNS settings are also ...
Sergey Dolgopolov's user avatar
2 votes
0 answers
1k views

Rejecting emails with mismatched Header/Envelop FROM

We've been receiving some spam/phishing emails that are managing to get through on occasion and the majority have a MAIL fROM our domain but their ENVELOPE from is whatever spammy address. My ...
Crimsonfox's user avatar
0 votes
1 answer
3k views

Postfix allow incoming mail for specified domain from specified ips

I am running a Postfix mail server. Some domains are configured that the DNS MX record is set to an antispam service. This service is forwarding the good mails to our mailserver. Some sender are ...
Dennis OWG's user avatar
2 votes
1 answer
767 views

Postfix reverse MX check

Is there any way to configure reverse MX check for Postfix to check incoming emails? I just noticed that most of our spam which are still coming true are sent (or seems to be sent) from properly ...
Tero's user avatar
  • 21
1 vote
1 answer
761 views

Postfix - Send spam to different email address

I've researched for an answer to this question and can't find anything. I have Postfix running on Debian Stretch. I will soon be setting up Rspamd. Here's the logic of what I want to have happen ...
pkSML's user avatar
  • 199
0 votes
1 answer
44 views

Incoming Email Server (I think) is Blocking Email Form

I’m not a server professional of IT person, so ignorance is admitted in terms of configuring servers. But this is why I am seeking direction from someone who knows more. When I build websites, it is ...
Steve C.'s user avatar
  • 101
1 vote
1 answer
6k views

Exchange office 365 transport rules to block spam when FROM doesn't match smtp.mailfrom or return path

I'm sure this type of question has been answered already so I apologize in advance, but I can't seem to find anything. I have spf, dkim, dmarc all setup so I'm not worried about outgoing spam, but I ...
Bryan Willis's user avatar
0 votes
1 answer
1k views

filtering spam emails with Chinese subject

A client have ton of Chinese spam. All look similar to this one: Return-Path: <[email protected]> X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on hotel492.dedicatedpanel.com X-...
Nick's user avatar
  • 882
0 votes
1 answer
1k views

How do I get Courier Maildrop to log data?

Background I'm running Ubuntu 16.04 LTS on a virtual machine. It is the mail server for a small medical clinic. We are trying to move mail filtering from the client-side to the server-side, and I am ...
Jared Clemence's user avatar
1 vote
1 answer
3k views

How to block SendGrid spam with sendmail?

Sendgrid and MailChimp are the two biggest sources of spam captured in my spam-folder. I'd like to block them before they get there. Fortunately, in an effort to appear "legitimate" the spammers ...
Mikhail T.'s user avatar
  • 2,401
0 votes
2 answers
5k views

Exchange 2013 - Remove warning text from outgoing email body

I created a transport-rule in our Exchange server 2013 where it will add a warning text on top of email-body to all external incoming emails. This is to alert employees about potential risks in ...
arifr's user avatar
  • 41
2 votes
1 answer
723 views

TXT entry in DNS for both gmail and amazon ses

It seems adding a TXT entry in DNS about Google is a good practice (when using gmail to send mail) to prevent being considered as Spammer. So I could add a TXT entry in my DNS records to: example.org ...
rap-2-h's user avatar
  • 125
1 vote
0 answers
34 views

Exchange rule to trigger on "From" addesses of format "email <email>"

We are receiving large email flow with an interesting pattern of "From" address. They forge body "From" address as "spoofed local email ". Example: From: [email protected] <[email protected]&...
Vesper's user avatar
  • 814
0 votes
0 answers
340 views

Could two emails sent at the exact same time to the same user cause spam filtering?

we are setting up a mail service which will send emails periodically. There are two kinds of email. One which is sent three times a day (8, 13, 17 o'clock). Another which MAY be sent at 8am ...
Worthy7's user avatar
  • 101
3 votes
0 answers
112 views

Combating a persistent spam list

We use Office 365 as our primary mail provider. We have an internal mail server that we use for relaying things like reports from our SSRS, scan to inbox for old scanners, etc. It is an IIS SMTP on ...
Sabre's user avatar
  • 445
0 votes
2 answers
3k views

SPF issue with different HELO FQDN

I am trying to setup SPF/DKIM/DMARC on my email server on a VPS. Here is my DNS configuration (DKIM & DMARC removed for readability) : @ 28800 A X.X.X.X @ ...
Skippy le Grand Gourou's user avatar
5 votes
1 answer
14k views

Improve Spam Confidence Level (SCL) for outgoing emails

I have a postfix SMTP server on Ubuntu. I have valid SPF and DKIM records, as verified by the email header my customer received. Authentication-Results: spf=pass (sender IP is XXX.XXX.XXX.XXX) ...
Raptor's user avatar
  • 1,031
0 votes
1 answer
32 views

Watch Guard Total Security working over VPN

We have a warehouse and 4 other showroom locations. All the 4 locations are connect to the warehouse through a VPN. If we get a watch guard for each location and connect through a VPN. Would it be ...
Brett Nelson's user avatar
0 votes
1 answer
1k views

Unknown ACL condition/modifier in in EXIM configuration for Rspamd

I am trying to configure EXIM to use Rspamd as a spam filter. I am running Exim version 4.87 and installed Rpsam from the repositories using apt-get as explained here. Then I added the suggested ...
arne.z's user avatar
  • 357