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Questions tagged [spam-filter]

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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 ...
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rspamd bayes classifiers per user and global

I' running email server with rspamd as spam filter. I have 2 bayes classifiers, one with original config named global and second with per_user = true named per_user. The per_user classifier has same ...
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Why would a receiving mail server check the DNS A record of the from domain against a blacklist?

Most (all?) of the DigitalOcean network is currently listed on UCEPROTECT Level 3 (again). I know that UCEPROTECT Level 3 is widely regarded as shady and I personally recommend to our clients that ...
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1 vote
2 answers
132 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 ...
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1 vote
1 answer
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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'...
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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 ...
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Postfix configuration with Dovecot, SpamAssasin default values not working

I got the below log when receiving the mail Fri Oct 22 19:06:24 2021 [3327677] info: spamd: connection from ::1 [::1]:41218 to port 783, fd 5 Fri Oct 22 19:06:24 2021 [3327677] info: spamd: using ...
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rspamD - multiple server setup

i already use rspamd within my mailserver construct. Currently there is only 1 rspamd instance on 1 server. For HA reasons i'd like to change this and add another rspamd server into my mailconstruct. ...
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0 answers
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How to properly configure MX Records for Spam Filter behind NAT

I am setting up proxmox mail gateway as my on-prem spam filter system to replace our external third-party spam filter system. My network has multiple public IP's which are all handled by my pfsense ...
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How to route/forward a specific email account from one Email Provider through Microsoft O365 Exchange Servers

My company has around 10 custom domain email accounts that were included our website's hosting plan. Our website sends out at least 300 emails a day in response to customer's requesting quotes for our ...
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1 vote
0 answers
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Continuous SPAM from certain IP/s hosting provider, how to report them if not responding at abuse@company.mail

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: ...
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1 answer
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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 ...
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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 ...
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0 votes
1 answer
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Is it ok (regarding spam) to use yahoo to send email from our domain me@mydomain.com?

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 ...
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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?
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-1 votes
1 answer
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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 ...
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1 answer
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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?
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-1 votes
1 answer
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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 ...
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1 answer
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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 ...
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1 vote
2 answers
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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 ...
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1 vote
1 answer
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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 ...
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0 votes
1 answer
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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 ...
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1 vote
1 answer
651 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 ...
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1 vote
0 answers
666 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 ...
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1 answer
2k 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 ...
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2 votes
1 answer
593 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 ...
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1 vote
1 answer
480 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 ...
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1 answer
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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 ...
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1 vote
1 answer
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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 ...
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1 answer
882 views

filtering spam emails with Chinese subject

A client have ton of Chinese spam. All look similar to this one: Return-Path: <15308409199@189.cn> X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on hotel492.dedicatedpanel.com X-...
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1 answer
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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 ...
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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 ...
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2 answers
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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 ...
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2 votes
1 answer
379 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 ...
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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: user@domain.com <forged@foreigndomain.com&...
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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 ...
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3 votes
0 answers
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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 ...
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2 answers
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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 @ ...
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3 votes
1 answer
9k 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) ...
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1 answer
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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 ...
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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 ...
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2 votes
0 answers
1k views

Accept or not to accept DKIM signed emails on my smtp server which source DNS don't has signature [closed]

In the outgoing emails we use in our domains SPF + DKIM without any problem. But with the inbound emails some time ago we're receiving emails from some of our customers/suppliers signed with DKIM, ...
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0 votes
1 answer
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What are the basic steps to start blocking spam on an internal Exchange 2016 server? [duplicate]

Recently I have taken over as both onsite IT and also head of our internal IT as the last IT guy resigned on my second day. Currently they just switched to an internal Exchange 2016 server and they're ...
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0 votes
1 answer
737 views

IIS 8.5 Request Filtering block referrer spam traffic

Recently I'm having a lot of requests that I see in google analytics from these domains (+25 others...): scanner-irvin.top scanner-viktor.top compliance-alex.top scanner-ivan.top scanner-jess.top ...
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1 vote
1 answer
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smtpd_recipient_restrictions: Some RBLs working, but SBL isn't

I'm trying to set up postfix so that it uses blocklists to block spam. This is my restriction setting in main.cf: smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,...
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SpamExperts filtering outbound mail

I've got a hosted domain & mail server. It is attached—somehow—to a SpamExperts installation. I've been training the filter for years and it does a fine job filtering out the incoming garbage. ...
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-1 votes
2 answers
2k views

Using a subdomain for email address [closed]

I have recently acquired a domain which closely resembles my last name (basically there are two words in my name and the domain is only the second word). The plan was to use a subdomain in order to ...
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0 votes
0 answers
628 views

Exchange 2013 -Prevent Spam emails from outside but with my internal domain name

my apologies if this question was asked and answered previously. we have Exchange 2013 email server. We have been seeing some of the emails are coming from outside but using our own domain name which ...
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1 vote
3 answers
3k views

Exchange 2010 ignoring SPF record

we are using Exchange 2010 and have already setup SPF record for our authorized mail server IPs. As a test using our domain name i tried to send an e-mail from another computer on the internet which ...
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0 votes
0 answers
869 views

SMTP Mail delivery failed for URIBL query refused

I'm experiencing some trouble with a single recipient because his mail server refuse my email. This is the error reply: SMTP error from remote mail server after RCPT TO:<xxxx@xxx.xxx>: 554 5.7....
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