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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

1
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1answer
24 views

Spoofing/Spam received from GSuite alias accounts

The company currently have 2 domains registered: "dom1.com" and "dom1.com.ex". "dom1.com" is hosted and is the main domain associated on our GSuite account to create user accounts to send mails, "dom1....
0
votes
1answer
13 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 ...
1
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0answers
42 views

Will enabling non-delivery notifications cause more spam?

In the past we received a lot of spam email. The past year it was a lot less and we would like to keep it that way offcourse. We are a construction company and we receive a lot of construction ...
1
vote
3answers
94 views

Is an MX-record required on a domain to send emails only?

Imagine the following scenario: There is a online-shop that sends emails with noreply@shop.mydomain.com There are no MX-records for shop.mydomain.com as no mail to this domain is wanted There is a ...
0
votes
1answer
44 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 ...
0
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0answers
35 views

My postfix server rejects my python script - “Client host rejected: cannot find your hostname”

I have a postfix on a server. When I'm trying to send an email from my python script, it gets rejected due to "Client host rejected: cannot find your hostname". How to allow an email come through? If ...
0
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0answers
45 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 ...
2
votes
0answers
40 views

How to restrict the addresses in MAIL FROM?

Good Nighttime, I've a postfix server combined with a mysql-database for address management. There is a table mapping the users and their mail addresses. e.g. |user|mail@domain.tld| |user|mail2@...
0
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0answers
12 views

Mail messages sent reaching spam [duplicate]

I have set up a Debian server, following the Perfect server guide, including Dovecot. Everything runs fine, except the fact, that most of the mails sent out of the server are reaching the spam ...
0
votes
0answers
48 views

How do I teach spam and ham to spamassassin running in a docker container?

I'm running SpamAssassin as a milter in a Docker container separate from Postfix and Dovecot. Postfix and SA work together nicely, Postfix connects to spamass-milter, SA does its thing, mail gets ...
0
votes
2answers
39 views

Unwanted emails are sent from some exchange users

In our exchange environment some unwanted emails are sent from a few users to abnormal addresses with .xyz suffix.They stuck in queue as the destination server isn't available. Affected users got ...
1
vote
1answer
105 views

fake emails with multiple addresses in “From:”

I receive fake emails with several addresses in "From:". For example: Return-Path: <karen@reachouttransport.co.zw> X-Original-To: Delivered-To: Received-SPF: None (mailfrom) identity=...
1
vote
2answers
59 views

Prevent using spam trap e-mail address on registration

I am running a website where the users register using their e-mail addresses and receive a confirmation code before they can log in. (After this every contact is opt-in.) Every now and then some user ...
1
vote
1answer
67 views

spam from sites on same hosting company: huh?

I'm running a public wiki (MediaWiki) on a VPS from a hosting company (a2 hosting) and I'm using reCaptcha v2 to prevent spam content. Recently, I've noticed spam articles that have slipped by. They ...
0
votes
0answers
33 views

WIreshark Filter to track Exchange Traffic from PC to Exchange Server 2007 and out

I've got a Windows Exchange Server 2007 that appears to be sending mail when I've confirmed nobody is on the network. I'm trying to determine if the exchange server is compromised or if a client on ...
0
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0answers
28 views

SPF and DKIM understanding

Can someone help me understand why if office 365 I have spam set to block anything that has an SPF Hard Fail. Why is this getting through? Also, I have seen where the email passes SPF and gets through....
4
votes
1answer
53 views

Sender Score Low

We host our own email server and have discovered we have a low sending score that is causing delivery issues. From the report (senderscore.org), there is an IP address outside of the U.S. (email ...
1
vote
1answer
62 views

Is Office 365 Exchange capable of SMTP connection-stage rejection?

Microsoft Office 365 Top senders and recipients report shows that 15-20 % of messages in the tenant are from postmaster@example.com i.e. Office 365 Exchange sends a lot of Non-Delivery Notifications (...
1
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0answers
74 views

Backscatter relay from Postfix backup mx server causing spam (553 5.7.1)

I have 2 Postfix Servers MAIN.mail.example.com BACKUP.mail.example.com Problem scenario: If spammer sends email from "me" to me directly to BACKUP, server forwards it to MAIN MAIN server reject ...
1
vote
0answers
14 views

Emails from my server are considered as spam on hotmail [duplicate]

Well all is in the title. How to be removed from their spam list? We don't use external email provider for now. We respect emails good practices: signed email, unsubscribe link, dest email... Here ...
1
vote
1answer
329 views

Setup policyd on Zimbra 8.8.x to rate limit the number of messages each account can send with smtp-auth

I'm running Zimbra 8.8.9 and I'm trying to rate limit the number of messages that a single user can send over smtp after authenticating with smtp-auth. The purpose is to limit the damage in case one ...
3
votes
1answer
42 views

Once SPF is correctly setup is it normal for spoofed email to go to spam folder or should Gmail deleted them?

In the spam folder of Gmail can be found illegitimate spam emails apparently sent from my own domain email address but from an origin not allowed by SPF. The domain is on G Suite emails. SPF is ...
0
votes
0answers
31 views

E-mail flagged as spam - maybe Exim/header problems? [duplicate]

Even implementing MX, SPF, DMARC and DKIM, whenever my server send an email to any Microsoft mail domain (Live, MSN, Outlook, Hotmail), it ends up in the junk folder. The other email services such as ...
0
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0answers
11 views

Smart Network Data Service reports spam from my IP. Nothing in my logs [duplicate]

I am facing a very strange situation. Microsoft's Smart Network Data Service is reporting that my IP is attempting to send hundreds of thousands of spams to Microsoft accounts every day. But, ...
0
votes
1answer
73 views

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 ...
-1
votes
1answer
42 views

One of my mailboxes sends a huge amount of spam to gmail and yahoo addresses. Cannot stop it

I'm stuck in here. I'm using ISPConfig on a Debian Wheezy Postfix mail server, and I have the following problem: I have multiple mailbox addresses on 14 domains. One of the addresses started 2 days ...
2
votes
1answer
43 views

What is meant by '550 Relay not Permitted' when it comes to emails?

For the past few months, I have been emailing a company with no problems. They have been able to receive my emails and they have been responding. A few days ago, they dropped me an email where my ...
2
votes
1answer
148 views

Block email in Postfix based on the “From: ” header address

I have Postfix configured to block email from a persistent spammer that has found a "bulletproof" spam service provider (known as Amazon SES), but of course the block fails because the MAIL FROM (aka "...
0
votes
1answer
86 views

Postfix: How to Interpret a Spam Attack in Log

Our Postfix mailserver was attacked by a spammer who was successful sending thousands of messages. Only ports 25 and 123 are open and the server is not an open relay, so I don't understand how the ...
-2
votes
2answers
208 views

“My domain” is being recognized as spammer for “no reason” [closed]

I linked my brand new domain, to yandex.connectand I sent only a few test emails, but NO email was sent or received. I checked many times the DNSs and they seem to be fine, When I send emails from ...
0
votes
1answer
194 views

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/...
0
votes
1answer
105 views

OpenSMTPd: Block sender based on “Received” domain

For OpenSMTPd, I would like to block a server from sending me mail based on the domain name of that server. It has a large number of IP addresses all over the place and blocking each individual one is ...
0
votes
1answer
22 views

distinct mail and web hosting servers with multiple domains; spam-avoidance, PTR and SPF records

Context. I have multiple domains web services being hosted on a Digital Ocean droplet (Ubuntu and Nginx in stack). Apparently, DO automatically sets up a PTR record. However, when I query host <...
-2
votes
1answer
28 views

When is an email rejected by the receiving server? [duplicate]

Currently, I am working on a web application and wanted to create a web form to let users write emails through it. So, they would have to set their email address and the message and after clicking "...
0
votes
0answers
89 views

Avoiding E-Mail spam filters (possibly based on originating computer?)

We recently started to send out a higher amount of E-Mails (invitations to a private event) to a select number of people. Now from some of those people using office365 for Mails, we were informed that ...
1
vote
3answers
306 views

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 ...
0
votes
0answers
82 views

Outbound Emails flagged as Spam from Wordpress but not Gmail(DKIM SPF issues)

I recently setup wordpress and pointed my domain to it. With that, we setup gsuite to handle email. We have the domain at godaddy and the server space on a VPS instance. I have added the MX records ...
0
votes
0answers
15 views

What are my technical options when it comes to scripting a message trace in an Ironport?

I need to automate message traces in a cluster of Ironports. What are my options? Based on my research I found A REST/XML style interface exists, but it only exposes monitoring endpoints for ...
0
votes
1answer
28 views

Emails go to spam folder on email server with MS Exchange

Emails from redwerk.com email server goes in spam folder on server with MS Exchange. I had performed all kinds of server checkings (SPF, DKIM, Blacklists). Had performed checkings on https://...
0
votes
1answer
87 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 ...
3
votes
2answers
361 views

Report phishing websites [closed]

Is there a central place to report domains that have made phishing attempts against my users? I usually make a report to the host of the domain (GoDaddy, generally) but I was wondering if there is a ...
0
votes
1answer
70 views

Can a DMARC “reject” policy prevent NDR backscatter?

Our email is being spoofed. We already have SPF/DKIM/DMARC p="quarantine" policies in place however we are still receiving thousands of Non-Delivery Receipt (NDR) in our inbox. Will changing to DMARC ...
0
votes
0answers
32 views

Do some smtp servers refuse to SEND to a spam-blacklisted host?

Is it known that some mail admins or mail programs setup their server like this? Is this a small minority? I don't have any examples, but i'm just curious.
0
votes
1answer
27 views

access SpamAssassin SpamBox from command line

I am trying to create a CRONjob to delete spam older than x days. I can do this from the command line with non-spam emails by using the following script: find "/home/account/mail/example.com/username/...
0
votes
0answers
280 views

Our email server is spammed with “Returned mail: see transcript for details”

We are running a fairly popular online service and since this morning our email inbox is spammed with emails like this "Returned mail: see transcript for details" by "MAILER-DAEMON@localhost....
0
votes
0answers
48 views

Identifying suspicious outgoing SMTP connections (a.k.a. spam) after CBL listing

The IP of my email server has been listed on Spamhaus CBL, which states that the server "attempted to send email without using the HELO/EHLO command", "[which] is generally indicative of a broken ...
0
votes
0answers
59 views

Outlook Junk Email Reporting Add-in when Outlook has multiple exchange accounts

One of our O365 users is receiving many spam messages that O365 is not blocking, but the spam pattern (sender display names start with a space character) cannot be blocked using Rules Wizard nor by ...
5
votes
2answers
648 views

Postfix: How to accept email with valid SPF but unresolvable hostname?

I have configured my Postfix to reject email sent from hosts without PTR record and hostnames that don't have A record. I found there are legitimate mail servers with valid SPF records which don't ...
0
votes
0answers
34 views

cron job tries to connect to repo-linux.com [duplicate]

I have a server that runs under Debian 8. There is a cron job that tries to connect to the site: repo-linux.com from my server. Message log tells: --2018-04-23 10:01:01-- http://repo-linux.com/a ...
1
vote
1answer
140 views

Mail Server allow sending spam to hosted mailboxes

I got an issue on both of my servers (Postfix + Dovecot and one on Zimbra) My issue is some robots send spam without login to our hosted mailboxes using the same FROM/RCPT. It seems Google got the ...