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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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 ...
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4
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3
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14k
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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 [email protected]
There are no MX-records for shop.mydomain.com as no mail to this domain is wanted
There is a ...
- 143
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1
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781
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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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0
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726
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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 ...
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2
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0
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1k
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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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2
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0
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73
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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|[email protected]|
|user|mail2@...
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0
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1
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913
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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 ...
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2
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94
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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 ...
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1
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506
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fake emails with multiple addresses in "From:"
I receive fake emails with several addresses in "From:". For example:
Return-Path: <[email protected]>
X-Original-To:
Delivered-To:
Received-SPF: None (mailfrom) identity=...
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2
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218
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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 ...
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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 ...
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0
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2k
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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 ...
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3
votes
1
answer
141
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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 ...
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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 [email protected] i.e. Office 365 Exchange sends a lot of Non-Delivery Notifications (...
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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 ...
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0
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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 ...
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1
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9k
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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 ...
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4
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1
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124
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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 ...
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0
answers
11
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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, ...
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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
126
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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 ...
5
votes
1
answer
26k
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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 ...
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1
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6k
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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 "...
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1
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1k
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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 ...
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2
answers
3k
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"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 ...
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1
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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/...
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1
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2k
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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 ...
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115
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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 <...
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130
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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 "...
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0
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0
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101
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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 ...
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3
answers
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 ...
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0
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264
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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 ...
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1
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931
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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://...
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1
answer
3k
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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
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2
answers
543
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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 ...
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2
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1k
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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 ...
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0
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36
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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.
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145
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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/...
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0
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4k
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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....
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278
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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 ...
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2
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2k
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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 ...
- 1,035
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1
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291
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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 ...
- 297
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0
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606
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Mail command in AWS EC2 ubuntu instance is sending emails to spam folder
Recently, i have upgraded my EC2 ubuntu instance from t2.micro to t2.medium in AWS to fight space related issues. Though the upgrade went well, mail command which was working fine in t2.micro started ...
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1
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766
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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 ...
- 199
0
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1
answer
1k
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How to pevent unwanted SMTP connections EXIM
I have a VPS configured to use PHP to send out periodical alerts via email (sendmail) where I connect via SMTP to a google apps email account. The server is using EXIM as the transfer agent.
In the ...
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3
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7k
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Receiving spam from my own email address. postfix
for 2 weeks now I keep receiving spam emails sent from my own address.
Here's an example :
Apr 2 10:15:13 hostname postfix/smtpd[28874]: warning: hostname 212.156.246.74.static.turktelekom.com.tr ...
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665
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Postfix is Still Sending out SPAM despite closing the Famous "Open Relay"
Lets pretend for a second there , my client's website is thatshowithappened.com
A couple of weeks ago our server was an open relay , we fixed that.
And now after putting
smtpd_relay_restrictions = ...
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1
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6k
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Identifying source of spam/malware emails apparently from Office 365 user
An office 365 user discovered that around 100 emails were sent apparently from him; they have some kind of malicious PDF attachment. The message headers show "Received: from XXX.XXX.PROD.OUTLOOK.COM" ...
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0
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496
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Spam from my Debian Stretch server - postfix
I have a huge problem with my Debian Stretch installation. Out of the blue one client email address started sending a huge amounts o spam.
My server uses standard configuration. I installed it with
...
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1
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6k
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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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