Questions tagged [spam]
Unsolicited e-mail, comments or posts, often sent out in large volumes; possibly but not necessarily commercial in nature
1,411
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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. ...
- 507
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0
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7
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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
...
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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 ...
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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 ...
99
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8
answers
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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 ...
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1
answer
5k
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EXIM SMTP allows to send mails without login / authentication via telnet to any domain
I'm ashamed, but I have to ask for help. My server is being used for sending spam, I've found out I can simply connect with telnet (edit: from any server in office, home and even directly from CMD/...
CommunityBot
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59
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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 ...
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23
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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-...
- 117
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24
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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 ...
9
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1
answer
5k
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How Does DNSWL work? How can I gain better trust? [closed]
How does DNSWL work? It's clear to me when someone report a spam, but how can I gain a higher score/trust?
Do some companies report "good" servers? Or will the score go up with time without reporting ...
- 1,030
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70
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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 ...
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1
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80
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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 ...
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75
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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 ...
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3
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5k
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Dovecot imap send spam to junk
I am using
Ubuntu 18.04 64 bit
dovecot 2.2.33.2
spamassassin 3.4.1
amavisd
The goal is to run an e-mail server, which I achieved already. I can access the e-mails at the server using Thunderbird ...
CommunityBot
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6
votes
4
answers
12k
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DKIM error: dkim=neutral (bad version) header.i=
Ive been struggling the last couple of hours with setting up DKIM on my Postfix/CentOS 5.3 server.
It finally sends and signs the emails, but apparently Google still does not like it. The errors I'm ...
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2
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163
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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....
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1
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104
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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 ...
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6
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3
answers
20k
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How to remove all messages from exim mail queue from a certain user/email
I've spend the last hour trying to figure out how to delete all messages from a certain mail address from the exim mail queue, after the queue was full of spam emails.
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2
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104
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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 ...
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2
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exim - Tainted filename for search - sender verify defer for failed to expand
discovered today this mailserver problem, and because have not written exim myself, can't debug it X-D
also: is this normal?
host zen.spamhaus.org
ping zen.spamhaus.org
ping: zen.spamhaus.org: No ...
- 1,797
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1
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99
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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 ...
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2
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201
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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 ...
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4
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2
answers
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Why do SpamAssassin and Razor2 penalize for specific domain name in HTML body?
We are an ESP provider from Czech Republic, Europe. Our clients are regular Czech companies with their own client database. Since yesterday, we have a problem with our domains used in emails for ...
- 1,030
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1
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969
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SMTP Server All Records OK But All Email Sent in Spam
i bought a VPS with dedicated IP address and running windows Server 2012.
I installed an SMTP server and DNS server, created all needed records: SPF, DMARC, DKIM, PTR, MX, and A.
These results test ...
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1
answer
62
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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.
...
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11
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4
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28k
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Postfix check outgoing mail for spam
How can I force postfix to check (and log/flag/etc) all outgoing mail for spam?
Just want to make sure I'm doing my part on my servers.
EDIT: Postfix config, as requested.
main.cf
# See /usr/share/...
- 9,749
0
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1
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164
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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 ...
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Mail loop between spam filter and 365
I was wondering if anyone has seen this before. We have our own spam filter cluster that emails go through before being sent on to 365. When emailing from our company domain (365 hosted) to another ...
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2
answers
582
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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. ...
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2
answers
420
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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, ...
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1
answer
397
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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 ...
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24
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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 ...
- 101
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3
answers
813
views
UCEProtect Level 3 - Emails land in SPAM
I am not sure how i can have remove the IP from UCEPROTECT Level 3.
Or a way in which i can send emails without them landing into spam.
The IP which i have used has only sent emails to the users ...
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2
votes
2
answers
925
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Adding mail header if postfix DNS based RBL (realtime black hole) check fails
I have setup a receiving Postfix mail server. Here i have custom code written that parses the whole mail received by postfix and use the headers, body and attachments separately for different uses.
I ...
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0
answers
79
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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 ...
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204
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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; ...
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3
votes
2
answers
722
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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 ...
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1
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313
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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 ...
- 9,872
0
votes
1
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691
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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 ...
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2
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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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0
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139
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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 ...
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1
answer
216
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"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 (...
- 1,298
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0
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150
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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 ...
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2
answers
868
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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 ...
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1
answer
37
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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 ...
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73
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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 ...
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1
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192
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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.
...
- 155
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8
answers
41k
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Remove blacklist from spamRATS
I have checked my IP in SpamRATS and the result is the following:
Standards Compliance:
Does IP Address resolve to a reverse hostname... Passed!
Does IP Address comply with reverse hostname ...
8
votes
3
answers
7k
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How to limit the From header to match MAIL FROM in postfix?
SMTP clients are required to pass user authentication before sending emails to other domains (relay). And we can use smtpd_sender_restrictions to make sure the MAIL FROM address matches the ...
CommunityBot
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7
votes
2
answers
23k
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Office 365 - what is in the "Sensitive Word List" for spam filtering?
In Office 365 you can toggle a few settings to help with spam email filtering.
Among these is a setting to enable a "Sensitive Word List" as shown below:
The problem is...I can't find any list on ...
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