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Questions tagged [spam]

Unsolicited e-mail, comments or posts, often sent out in large volumes; possibly but not necessarily commercial in nature

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Should smtp_helo_name always be the same as your MX record?

I can't seem to satisfy HELO checks on SPF records in all cases. I have an SPF record for my domain like this: "v=spf1 mx -all" The MX records in the zone are: mx0.mydomain.org.uk. ...
TommyPeanuts's user avatar
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7 views

Why does the SpamAssassin not insert some headers?

Trying to configure SpamAssassin 4.0.0 with Postfix 3.7.10 on Debian 12. I'm using spamass-milter 0.4.0. My /etc/spamassasin/local.cf has the following entries: required_score 5.1 ...
thomson's user avatar
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0 answers
37 views

Configure fail2ban to parse multiple log lines, e.g. Postfix mail rejects

I want to to block local authenticated mail users who generate spam, i.e. disable their SMTP access for a while as one of several countermeasures against hijacked accounts and malware. To accomplish ...
Jens's user avatar
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1 vote
0 answers
59 views

My email server IP is blacklisted, how can I resolve it?

The IP of our email server 154.116.254.147 was added to the UCEPROTECTL2 blacklist. The error message we received is as follows: "I am deeply sorry, but I was not able to deliver your mail to the ...
Sistemas DSRC's user avatar
2 votes
0 answers
65 views

how to protect postfix mail from gmail spam [duplicate]

I am experiencing an issue with the BDIX (Local Bangladeshi server) server. I have set up a mail server on the local BDIX server using postfix with aapanel. I have configured SPF, DKIM, and DMARC in ...
Rumaion Tomal's user avatar
1 vote
0 answers
23 views

Postfix configuration to block spammer domain isn't working

I have an Ubuntu 22.04 cloud VM with Postfix 3.6.4-1ubuntu1.3 installed that I largely use for receiving e-mails sent to addresses at my personal domain that I provide when signing up for less-...
jwodder's user avatar
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24 views

SPAM and SPOOF emails from postfix mailserver

I created and configured a postfix server, basically its an smtp-only server. I added the domain i want to use in postfix main.cf, and also added other domains in virtual file. I installed configured ...
Hussein Khazem's user avatar
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70 views

What are these DMARC failures about?

I've been toying with dmarc off and on for the last couple of months. Currently I have no policy set. I am using URIReports for report collection and analysis. Most of the results are good. We use ...
Rob Brandt's user avatar
0 votes
1 answer
80 views

postfix bounce_queue_lifetime and maximal_queue_lifetime

i have done a lot of research but still cannot clearly understand what is the difference between postfix bounce_queue_lifetime and maximal_queue_lifetime in main.cf. Although I've read a lot of ...
iamaduwb's user avatar
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0 answers
75 views

Can I ignore certain visitors when using Goaccess?

I want to use goaccess to see how many real visitors my website is getting. Unsurprisingly my logs are filled with traffic from bots so I'm looking for a way to filter that out. In the interests of ...
Matt's user avatar
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2 answers
163 views

How to detect non-latin scripts in email subject?

On my mail server running Postfix, I want to reject mails using some non-latin scripts in their subject, in particular Arabic and Cyrillic since none of my users (family) speak languages that use them....
DarkDust's user avatar
  • 266
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1 answer
104 views

Weird email spam issue. Google Domain Exchange email server

We have a client who is blocking our email domain. Their IT wrote this to us. I've never seen this be an issue before. You are hosted on Google but have entries referring to Microsoft email protection ...
Phi's user avatar
  • 101
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2 answers
104 views

Check incoming email adresses on exchange server

We are using Exchange Server with Outlook, and a CMS system to manage our customer's Email addresses. The CMS can export the email address list and we could import it somewhere to outlook/exchange, if ...
Jan Katz's user avatar
0 votes
1 answer
99 views

postfix sending only short messages ( emails ) but not long messages?

when I am sending a short email from "[email protected]" or any other email acc , the message is received well in the inbox of Gmail , hotmail etc , but if I send the message again with long ...
Khodour.F's user avatar
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2 answers
201 views

Spammers are using my mail server to send out emails

Lately spammers are using my mail server to send emails to different addresses. For example, a colleague of mine received an email that was supposedly self-sent (it was not). Looking at the ...
np1's user avatar
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-2 votes
1 answer
62 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
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1 answer
164 views

Amavis outbound mail filter for Postfix?

Running Postfix on Ubuntu 22.04, I'd like to make sure all outgoing mail originating from the server (eg mail forms on websites and stuff) is filtered for spam and malware. I'm using Amavis, which is ...
TommyPeanuts's user avatar
1 vote
2 answers
420 views

Email message headers pass SPF check after failing earlier SPF checks. Will this result in spam?

I have an issue where email is being marked as spam by Gmail/Google Apps systems. When reading the mail headers, the most recent SPF check in the mail chain passes, but earlier checks fail. That is, ...
Ned Martin's user avatar
0 votes
2 answers
582 views

Spammers slipping through SPF

One of the subscribers on the mailhost I run has been receiving scads of spam mail "from himself." With SPF set up and validated on the domain (wickenburg.us) this should not be happening. ...
Macs R We's user avatar
0 votes
1 answer
397 views

Where can i find explanation of a SpamAssasin scores like SPOOFED_FREEMAIL?

I can define custom scores for SpamAssasin, default one seems to be zero and it makes me wonder if i should raise it, but before doing so, where can i find detailed information on how these particular ...
16851556's user avatar
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0 answers
24 views

Server still sending spam despite closing relay with postfix [duplicate]

I have an Ubuntu 20.04.5 LTS with multiple Wordpress website running on Nginx. I installed postfix and configured it to stop relaying emails. I have an antivirus freshclam running. Someone or ...
Henri's user avatar
  • 101
0 votes
0 answers
79 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
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0 answers
204 views

In Postfix, how do I block all clients whose reverse DNS is in a domain?

I just got hit by a spammer sending spam through my mail server from multiple IP addresses in various netblocks all with a reverse lookup ending in googleusercontent.com. (I haven't figured out how; ...
Pierre Abbat's user avatar
0 votes
1 answer
313 views

How to make a mail server spam "proof"

I work for a German company that sends several thousand emails to our customers every day. Our employees send their emails via Microsoft 356, but the system does not use a mail server and sends emails ...
Pa0x43's user avatar
  • 15
0 votes
1 answer
691 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
3 votes
2 answers
722 views

Changing hostname for the purpose of email delivery

I have email delivery issues, and MXtoolbox says "Reverse DNS is not a Valid Hostname". I have A and AAAA records for domain.com and mail.domain.com. The data center has set up reverse DNS ...
Mikkel Rev's user avatar
1 vote
0 answers
139 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
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0 votes
0 answers
150 views

Fail2Ban redirect instead of drop

I'm trying to configure Fail2ban to redirect instead of banning, I've found plenty of posts about redirecting to a different port for HTTP traffic to display a different webpage, but I need to ...
BruceLeeRoy's user avatar
2 votes
1 answer
216 views

"Non-Open-Mail Relay" Postfix / Dovecot are relaying anyway; Mis-configured or CRACKED? Plus, presently blocked external users need access too

CRITICAL UPDATE While working on this, there'd been no spam relayed for over a single day so I left it up and overnight, TWO emails got relayed! ACK! Here they are, from my tail / grep commands (...
Richard T's user avatar
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-1 votes
1 answer
37 views

Long established Postfix / Dovecot environ had to be rebuilt, became an open relay; How do I know fore sure it's fixed, and, if not, fix it fast?

Because it's bad form here to ask multiple questions in ONE entry, I'll be asking about specific Postfix and Dovecot entries, however this nightmare has been going on since about January 19 and it's ...
Richard T's user avatar
  • 1,298
0 votes
2 answers
868 views

How to disable the default RBLs used by rspamd?

I'd like to use an RBL in rspamd without using all the preconfigured RBLs, but it seems that the configuration in /etc/rspamd/local.d/rbl.conf can only add new lists, not remove the default ones. The ...
allo's user avatar
  • 1,733
1 vote
0 answers
73 views

Server getting spam requests by the same IP address opening Apple App Store

I have a simple docker-containerized nginx application. I'm getting spammed with requests when I view the nginx logs via docker-compose logs -f webserver (this is thousands of lines but I'm leaving ...
ned31469's user avatar
0 votes
1 answer
192 views

How to improve sender score for personal mail server

Background: I have an own domain and an own mail server that sends out the mail for this domain. The users are only my family so there are less than 10 users with probably 20 mails sent per day. ...
Tode's user avatar
  • 1,013
0 votes
1 answer
690 views

spamassassin and subject utf base64

I have a problem with some spam messages with the subject field encoded in utf8 base 64 and weird characters used to fool the filter rules example: raw subject of incoming email Subject: =?UTF-8?B?...
hcomputer's user avatar
0 votes
1 answer
56 views

Increase in spams through website contact forms after change of server

I recently moved my website from Hostgator to an Amazon Web Services' EC2 instance. From a few days later people/bot started posting spam messages in the forms that are on the website. Is there ...
manish.mandal's user avatar
0 votes
0 answers
47 views

Rule - Check for an email with an image tag

I hate spammers phising emails, it doesn't contain anything but an image with in the body. I'm wondering if there is a rule, I can check if the email body contains only and only <img> and no ...
code-8's user avatar
  • 191
0 votes
0 answers
530 views

Sendgrid IP Address Consistently Blocked on RATS-Spam

Overview For our application, we use SendGrid to send emails to many of our users. Recently over the past few weeks, our SendGrid IP addresses have been added to the RATS-Spam blacklist multiple times....
su-ayoo's user avatar
0 votes
1 answer
628 views

Completely block any outgoing emails

I have a server with Postfix, running in Docker. The server is supposed to only receive emails, not send them. I added the following iptables rules to try to block anything getting out from port 25: ...
Nifhel's user avatar
  • 103
0 votes
1 answer
108 views

Managing SPF with multiple users on an email provider

I'm using Ipower for web and email hosting. I was recently made aware that SPF and DMARC were set to neutral, causing all of our outgoing emails to go to spam. I updated both records and they worked ...
Neil C's user avatar
  • 9
1 vote
1 answer
3k views

Spamhaus is blocking several customers since a couple of days?

I received a couple of complaints from customers that got their emails rejected. I haven't changed my config, so this must be an issue with spamhaus. I'm running Postfix with these settings for ...
3und80's user avatar
  • 353
0 votes
1 answer
865 views

Publishing Exchange Server public IP address in a hybrid Exchange setup?

I'm currently using the Hybrid Exchange Online and Exchange Server OnPremise setup. I have included the IP addresses of all my Exchange Servers in the below TXT record, I wonder if it is really ...
Senior Systems Engineer'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
7 votes
2 answers
1k views

How can I create and update the existing SPF record to allow more than 10 entries?

How can I include another SPF record if my existing domain already has 10 lines of SPF records in the TXT record? I wanted to add these two: include:mailgun.org include:sendgrid.net This is my ...
Senior Systems Engineer's user avatar
0 votes
0 answers
227 views

Spam URL block not working with Cloudflare

Quite confused... Apache Access Log is constanmtly showing spam URLs being called after a Wordpress website hack. I think I have removed the hacking, but something is still calling these spam URLs on ...
Laurence Cope's user avatar
0 votes
1 answer
162 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
0 answers
636 views

DKIM: validation error: error:RSA_padding_check_PKCS1_type_1:invalid padding

We receive a lot of spam on our servers from 3rd party servers and often this spam includes the email header such as: DKIM: validation error: error:0407008A:rsa routines:...
Martin's user avatar
  • 217
1 vote
1 answer
638 views

Local Mail Transport Protocol (LMTP) spam?

Our sever receives a fair bit of spam, most of this is standard spam but looking at the headers of some spam we get directly it seems to show that the mail is received by the LMTP (Local Mail ...
Martin's user avatar
  • 217
0 votes
1 answer
947 views

How to prevent 3rd party domains using our server/domains for email envelopes

We recently received a whole bunch of notification emails stating an email that apparently originated from our servers was blocked for being spam, but we can't find the source emails on our server, so ...
Martin's user avatar
  • 217
1 vote
0 answers
316 views

Some of my emails do not get to clients without a warning

I send emails from the web interface of Gmail Workspace (business email). Most of the clients receive my letters just fine. But some of the clients only receive messages with text and images. Messages ...
Bobrovsky's user avatar
  • 111
0 votes
2 answers
2k views

How to prevent unauthorized relay of mail in Postfix

It seems that our mail server is being used to send spam. The sender of the email is a spoofed real account on our server. There is no email in the sent history for that account. I would like to ...
adm's user avatar
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