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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Ubuntu 16.04 Postfix works, but email goes to SPAM

Hello i follow this guide to install Postfix https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-as-a-send-only-smtp-server-on-ubuntu-18-04 and i added SPF, dmarc ...
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21 views

Exchange Online - List-Unsubscribe

I am trying to achieve having List-Unsubscribe header functionality for our marketing emails that are being sent using Distribution list. 3rd party mailing is a no-go. I have opened a case with M365 ...
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14 views

What does CBL mean? How to spot infection by making outbound TCP connections to 110? [closed]

I have an IP blocked by Spamhaus CBL, and it tells me the following instruction: This IP address was detected and listed 2 times in the past 28 days, and 2 times in the past 24 hours. The most ...
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7 views

Blocking everything from sending mail except postfix

How could I use iptables to block anything except the Postfix user from sending mail? It would be useful in case a web app such as wordpress got infected with malware and started sending spam. We ...
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11 views

Debian 10.4 / Exim 4.92 add incremental delay to the unsuccessful login attempt answer

Browsed over all the internet, but cannot find an answer - is there any acl or something that I could apply to unsuccessful login attempt to add delay to it? As probably anyone running mx, I have a ...
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17 views

SpamAssassin shows an error of HTML_IMAGE_ONLY_XX. But I do not have an image in my email

SpamAssassin shows that my email is going to spam with the error "HTML_IMAGE_ONLY_20" or "HTML_IMAGE_ONLY_16". From what I read and understood so far, this is because SpamAssassin says my html has an ...
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22 views

Why are my error logs full of 404s for “adult” content?

Idly perusing my site's error logs this morning, I was shocked to discover that a large number of rather explicit had been requested. (I don't mind telling you that I very nearly sprayed my cold brew ...
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20 views

Make nginx respond to only a single domain on HTTPS

I have an internet-facing nginx server configured to serve example.com on a dedicated IP address. However, as long as the request reaches the server, even if the requested domain was wrongdomain.org, ...
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1answer
13 views

Setting up SPF record for A2Hosting shared hosting

I'm trying to setup A2Hosting SPF correctly since the proposed SPF is landing the emails in the SPAM folder in Gmail. This is the default SPF: v=spf1 +mx +a +ip4:210.125.99.77 ~all But when ...
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18 views

FreePBX / Asterisk: use inbound routes to block spammers/hackers

My FreePBX / Asterisk configuration was recently forced into allowing both anonymous inbound calls and SIP guests. So of course we're now getting blasted with spam/hack attempts. They show up in the ...
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2answers
339 views

How does DKIM work when sending emails from multiple sources/servers?

So if I'm understanding DKIM correctly, it basically is a public/private key type of service. However, how does this work if you send emails from multiple servers/sources? For instance, I have a ...
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23 views

The DMARC test failed but we didn't find any obvious reason why

One of our users recently found out his emails are going to spam for some reason. This made me dive into everything and the last thing I can't seem to figure out is the Dmarc. We're using gmail for ...
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1answer
31 views

Why are my Postfix mails recognized as Spam? [duplicate]

I have a Postfix mail that I have configured pretty good. mail-tester.com gives me a 10/10. I have tested on both Google and Yahoo, and checked their headers. Nothing seems to be wrong in the headers. ...
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38 views

where is the amavisd mailnotification template?

How can I change the default text of the amavisd notification email to an administrator when a virus is detected? I use a Centos7 system with Postfix and Clamav. I've searched all over the internet, ...
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24 views

Ubuntu 16.04 & Plesk Obsidian 18.0: Possible spam messages - false positive?

I'm using Ubuntu 16.04.6 LTS with Plesk Obsidian (version 18.0.25) on a dedicated vm. After installed the last plesk updates there is a message on start screen from plesk: Possible spam: View report ...
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9 views

wishing to blacklist email based on partial email addresses SpamAssasin

I am getting emails where part of the domain name is the same. For instance, i am getting spam from xxx@msg123.com and xxx@msgabc.com. I would like to blacklist any email address that has the ...
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2answers
55 views

Is mail rejected by Exim's !verify = header_syntax ACL item, with RFC 2047-encoded From/To headers, legitimate?

A recent Exim upgrade added this to the default acl_smtp_data ACL: .ifndef NO_CHECK_DATA_VERIFY_HEADER_SYNTAX deny !acl = acl_local_deny_exceptions !verify = header_syntax message = header ...
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2answers
82 views

Our IP was listed by Spamhaus - how can we prevent this from happening again?

I'm the technical assistant at a small-town public library where we run our own e-mail. If it matters, it's Postfix on an Ubuntu 18.04 box. Gateway / firewall is a 16.04 box with port forwarding set ...
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3answers
59 views

Sharing IP black lists

Are there any tools similar to fail2ban that would allow sharing of IP black lists? What I'm looking for is something similar to a DNS based blackhole list or real-time blackhole list as is used to ...
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0answers
43 views

Office 365 is quarantining email when mail-flow rule sets SCL

We are trying to use a mail flow rule to ensure certain emails do not get quarantined. This has worked elsewhere, however we are having issues with one client. Looking at the message events we can see ...
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87 views

How to avoid gmail orange mark and spam filter when using cloudflare proxies?

I send emails from my site via php smtp method connected to 'smtp.gmail.com' on 465, and account added to GSuite. All my emails falls in spam folder in Gmail. The kind of emails is just password ...
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1answer
127 views

Find exim account sending lots of emails. (Spamming)

I have an Exim server with several domains configured. In each domain I have several email accounts. From time to time a computer configured with one of this emails gets infected and starts sending ...
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1answer
38 views

Spam Email Delivery and MX Records

I hope this is an appropriate post. We've had some sites on VPS's hit with a recent hack. The hacks were cleared up, the sites were set as "devious/dangerous" by Google were re-scanned by Google in ...
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1answer
141 views

SPAM Domain Spoofing through SES

A spammer seems to be running spam through SES and spoofing our domain. We are using SPF and DKIM so I’m not sure what is going on. This is our SPF record: v=spf1 a mx include:amazonses.com include:...
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29 views

Website Change causes Spam classification of emails

TL;DR: Emails containing a link to our company website are marked as Spam by different providers. How can I find the reason for this, and how can I stop it? Several weeks ago, the company that wrote ...
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104 views

postfix dovecot roundcube send email to spam like gmail and hotmail

Im looking for good solution send mt emails to the inbox folder not to spam so here you can see my email log: Dec 23 11:27:03 h2833070 postfix/smtpd[4218]: connect from localhost[127.0.0.1] Dec 23 ...
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2answers
361 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 ...
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2answers
61 views

Emails from my domain (hmailserver) are always in YahooSpam

Hi during sending out my mails from my domain luxpost.com they are placed directly into spam folder in yahoo. I tried to analyse the raw header and got only DKIM warnings. So I placed a DKIM entry in ...
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1answer
52 views

O365 Emails Getting Marked as Spam when Moved to new Folder

One of our main inbound mail accounts seems to be having a strange issue where the emails are getting marked as spam, not when they arrived, but when they are moved to a folder. They are also all ...
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15 views

Postfix sending spam from localhost [duplicate]

My email server entered reclently on all mail blacklists possible. Reading the logs, all I can see is that the client is my own server. postfix/smtp/smtpd[8630]: C98A122201F: client=localhost....
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1answer
47 views

Spamassasin rule to flag certain MX IPs

I've noticed a flood of spam that is related to the same range of IPs. All the spam email has different HTML text (which is english but meaningless) and a few embedded pictures (which I block) but ...
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34 views

Are email services looking at the “From address” along with the envelope sender when doing SPF lookups?

First, I understand the caveats and flaws of SPF as an aging authentication technology, and understand that it should be used in conjunction with DKIM and DMARC and is not a panacea for deliverability....
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1answer
154 views

postfix server on VM - mail relay

I've setup a mail server according to this setup: https://thomas-leister.de/en/mailserver-debian-stretch/ The documentation itself looks quite good to me - is well explained and seems to work... ...
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1answer
94 views

how to reject emails with specific subject on Mail server postfix spamassassin?

I have postfix and spamassassin. recently I found an email with subject "XXX" to all company email addresses and aliases. So I was wondering if I can reject sending emails with specific subject "XXX" ...
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26 views

Postfix forward mails to external domains as (inline) bounce

My problem: I own a postfix server with several Aliases on it. For example: info@my.tld => abc@gmail.com If I now send a email from def@gmail.com to info@my.tld it get's forwarded to abc@gmail.com ...
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171 views

Linux history filled with priv_escl_start and _end after security changes

We are going through a process to make our linux servers more secure following a scan. I notice that on some of the machines, we now have lines like: LANG=C; printf "priv_escl_start_%s" "[random 8 ...
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1answer
40 views

Drop newsletter emails with Postfix

There is an option, i have seen in Fortimail, that makes you able to filter/drop all newsletter emails. I don't understand how Fortimail detects these type of emails. And I am keen to know whether ...
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0answers
52 views

Email goes to spam, even after all tests are passed, postfix [duplicate]

This is my email headers, I replaced my domain name with domainname Please help me find out what can be the reason. I also tested with https://www.mail-tester.com, it gives 10/10 score. Delivered-...
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26 views

How to find who is spamming in my server if there is no trace in EXIM log [duplicate]

I have an odd problem. I received reports that my server is spamming the world right now. They reported me 8 fresh email headers of spammers, so I searched in email log /var/log/exim_mainlog . I ...
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1answer
421 views

Yahoo blocked emails after changing mail server public IP address

We have two exchange edge server and we want to change their public IP addresses. Changing one of the server IP addresses (and related DNS records) was done successfully and emails are delivered to ...
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0answers
35 views

DKIM and SPF for Different Server [duplicate]

My situation like the following: Web server hosted in Google Cloud with domain name lets say: example.com Mail server hosted in Linode (lets say in server name: server.myserver.com) using cPanel with ...
0
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1answer
94 views

Mailserver sufficient to pass as non-spam with Gmail

I am coming to the point of thinking this is beyond my ability to accomplish. I have repeatedly built new servers on Digital Ocean (3 so far) with Postfix, Dovecot, DKIM, pretty much everything out ...
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0answers
22 views

How to set limit for authenticated Postfix virtual user (possibly with infected PC) on outgoing emails?

I have Postfix SMTP server and about 50 virtual users who use this SMTP server for sending outgoing emails. Few days ago happened, that one user got virus infection and it started sending through this ...
0
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1answer
330 views

How to cut-off spam (postfix+amavis-new)

I'm using postfix+dovecot+amavis-new+clamav+spamassassin+postgrey on my Ubuntu based VPS. Since some days i'm receiving a lot of spam, with a low level of spam score in headers. Common for all spam ...
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0answers
19 views

Postfix >2.10 CentOS vs Email Checkers and Unknown senders

I have an Email Server well configured and working fine with CentOS 7 and Postfix >2.10. and I have two different questions: 1- How to configure Postfix to prevent Email Checkers like ex.: email-...
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0answers
16 views

Email piping through to Junk folder

I have a personal business email that I know sometimes pipes to junk, even if I've shared correspondence previously with the recipient. I'm doing all I can to fix this but in the meantime I've set up ...
4
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1answer
250 views

Postfix: ACCEPT if RBL and SPF checks pass, DUNNO/greylist otherwise. How to do it?

I would like to accept all clients that pass RBL and SPF checks (and possibly some checks, but these are minimum requirements for me), and greylist those who don't. When a client passes the SPF check (...
0
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1answer
253 views

How to Block a Domainname with random TLDs in Postfix?

Can anyone please tell me how to reject all domains with a particular name, but regardless of the TLD? I want to block all mail coming from domains named bulksender, like bulksender.com, bulksender....
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1answer
197 views

I have set up Spamassassin. Only outgoing emails are scanned by spamassassin and not incoming ones

I have set up spamassassin with postfix. The problem is I tried testing the spamassassin default filter by sending the GTUBE spam test email from gmail to my mail server. Spamassassin is not even ...
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1answer
98 views

Emails going to spam even though DKIM and SPF records set up and rDNS too in EC2. I am usinf postfix and dovecot [duplicate]

I have set up my own email server in AWS using postfix and dovecot. I have also set up DKIP and SPF and DMARC records. Now the problem is when i send an email from admin@example.com, its not flagged ...

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