Questions tagged [spam]
Unsolicited e-mail, comments or posts, often sent out in large volumes; possibly but not necessarily commercial in nature
229
questions with no upvoted or accepted answers
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systemd-udevd spams systemd-udevd[1523120]: veth20996a5: Failed to get link config: No such device
I have setup my server logging with graylog and now I see that my logs are being spamed by level: 3 errors like these:
systemd-udevd[1523120]: veth20996a5: Failed to get link config: No such device
I ...
- 151
5
votes
2
answers
2k
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Disable Outlook Web Access Junk filtering in Exchange 2013
By default, Outlook Web Access (OWA) in Exchange 2013 seems to move suspected junk mail to the Junk Email folder. This is undesirable behavior in most of my environments because we have Barracuda Spam ...
- 199k
4
votes
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 ...
- 41
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 ...
- 147
3
votes
1
answer
651
views
apache deny all proxy request
I have some apache server on ubuntu and fore some times there a lot of requirest in /var/log/apache2/access.log like this:
115.231.218.252 - - [04/Dec/2017:08:35:38 -0500] "CONNECT www.alipay.com:443 ...
- 201
3
votes
0
answers
444
views
Prevent misdirected bouncebacks from forwarding server
Note: This question is a duplicate of Avoid creating backscatter on a Postfix forwarding server, for which the only answer was "sorry, nothing you can do", but I provide more detail here, consider ...
- 131
3
votes
0
answers
2k
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Outlook.com rejects: 550 SC-001 (BAY004-MC5F13)
I am operating a cluster of 3 dedicated machines for a webapp, each of those uses sendmail as MTA. Hostnames are node1.domain.com node2.domain.com node3.domain.com
Unfortunatelly outlook.com rejects ...
- 2,192
3
votes
0
answers
785
views
SFP + Gmail = Emails delivered to spam box
A long time ago I posted a question here: Postfix: Gmail marking my email as spam where I said that although emails send from my servers were passing all the DKIM and SPF tests they were getting ...
- 1,258
3
votes
1
answer
2k
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Exchange 2013 IPBlockListProvider blocking some (but not all) matched IPs
I have configured our Exchange 2013 Edge Transport server to utilize several IPBlockListProviders including Spamhaus. While they work great most of the time, there are still some emails which despite ...
- 31
3
votes
0
answers
584
views
Spamassassin internal DNS resolution?
Short Version: Is it possible to configure spamassassin to perform its own recursive DNS lookups instead of using the server specified by the OS?
Long Version: I've got a collection of dedicated ...
- 2,161
3
votes
0
answers
420
views
How to identify the user/computer that is relaying spam through a mail server?
For the past couple of days, at certain intervals, a huge load of email is dumped on my Exchange 2003 server and relayed out until it gets blacklisted everywhere.
Nothing like this happened for many ...
- 199
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 (...
- 1,298
2
votes
0
answers
1k
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How to solve '521 5.7.1 Service unavailable; client x.x.x.x blocked using Return-Path'?
How to solve or interpret following error? I'm not sure if anything should be done on client (sender or sending account of a domain) or ask remote postmasters for help.
<[email protected]> (...
- 597
2
votes
0
answers
101
views
Exim: Redirect mails without spooling
I am running a personal mail server using exim that only forwards mails (and also runs a few mailman mailing lists).
Unfortunately, my server’s spam protection is worse than that of the mail provider ...
- 4,049
2
votes
0
answers
555
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 ...
- 21
2
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0
answers
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 ...
- 355
2
votes
0
answers
73
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|[email protected]|
|user|mail2@...
- 121
2
votes
0
answers
443
views
Anti-spam filtering in Exchange 2016 almost doesn't work
I have fresh installation Exchange 2016. I know that content filtering is depreciated since November 2016, and in some future we'll have to use EOP.
So far I've read, content filtering in Exchange ...
- 237
2
votes
0
answers
807
views
How to stop Postfix from forwarding SPAM without blocking local users' SPAM?
Some of my users have aliases in /etc/postfix/virtual that forward to other providers (mostly gmail). I believe that the fact that all mail is forwarded (even SPAM) is causing reputation issues for ...
- 489
2
votes
0
answers
686
views
Spam ranking explodes if a certain URL is mentioned in email body - why?
If any email contains the URL lafargeholcim-foundation.org or if an email is sent using an email address from that domain, certain providers rate those mails as Spam, others not at all. It is enough ...
- 901
2
votes
1
answer
1k
views
spamassassin how to remove explanation and score breakdown in the message?
I have setup SpamAssassin in Windows (using the JamSoftware), created a service for spamd.exe and currently SpamAssassin works fine. However, I would like to disable the explanation that SpamAssassin ...
- 1,187
2
votes
1
answer
134
views
Setting DKIM and SPF records for client domains
I have created an email server that is capable of handling mail for multiple websites. e.g. [email protected], [email protected] etc. The emails are sending and receiving fine, but the spam score is ...
- 706
2
votes
0
answers
2k
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Exchange 2013: content filtering bypass
I have just completed a migration from a single Exchange 2007 to 2xExchange 2013 servers in separate sites. Mailflow is working correctly, but the anti-spam content filtering is not working as ...
- 21
2
votes
1
answer
797
views
Restrict IMAP access for a given account to only one IP address in Exchange 2013
I've created a "spam crawler" account with full access to all mailboxes in an Exchange 2013 environment to get messages in the junk folder to feed the Bayesian filtering running on SpamAssassin in a ...
- 5,700
2
votes
1
answer
743
views
Postfix: don't bounce for remote rejects
I'm having a problem with sending bounces to spammers when a remote "trusted" smtp server rejects a mail. My server manages mail for company1.com that has a virtual alias [email protected] that ...
- 21
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 ...
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-...
- 117
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 ...
- 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 ...
- 11
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 ...
- 111
1
vote
0
answers
108
views
spamassasin unable to read Japanese when it is html encoded
I would like to block some emails which contains certain Japanese words, but spamassassin fails to detect such words when the email is HTML encoded, for example:
This is a multi-part message in MIME ...
- 469
1
vote
0
answers
154
views
Continuous SPAM from certain IP/s hosting provider, how to report them if not responding at [email protected]
last maybe 4 weeks is coming SPAM e-mails from various domains. In common is that when i paste the source code of the e-mail to
https://www.spamcop.net
is detected this provider and their mailbox: ...
- 536
1
vote
0
answers
5k
views
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 ...
- 11
1
vote
0
answers
294
views
Google Postmaster: IP reputation of subdomain and main domain identical
We have a main domain, example.com. We use this to send regular emails via Google GSuite.
We also have a subdomain, say sub1.example.com. We use this to send campaign emails through an email marketing ...
- 111
1
vote
0
answers
590
views
how to block emails from helo=localhost.localdomain
at my email server postfix, dovecot, amavis, spamassassin are blocking spam well, but some spam emails with bad HELO (helo=localhost.localdomain / Received-spf ....envelope-from=<>; receiver=<...
- 11
1
vote
0
answers
151
views
How to find malicious PHP script that sends emails from my domain?
My organization mail has been blocked by a malicious PHP script for several days. I learned that spam messages are sent via the mail() function.
How can I find and delete this script on my server? I ...
- 11
1
vote
0
answers
239
views
Spamassassin keeps marking as spam despite low score
I have postfix with Spamassassin and spamass-milter configured.
E-mails with score higher than 4.0 are supposed to be treated as a spam and be rejected.
Here is my local.conf
rewrite_header Subject ***...
- 11
1
vote
0
answers
546
views
Yahoo Mail server constantly deferring mail from my server "due to user complaints"
I have a 100% no-spam score on mail tester.
Have no problem with Gmail server, all users getting my emails.
Have everything like SPF and other spam related criteria enabled.
Yet, Yahoo mail server ...
- 111
1
vote
0
answers
69
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 ...
- 924
1
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0
answers
356
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 ...
1
vote
1
answer
229
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 ...
- 506
1
vote
0
answers
2k
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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 ...
- 79
1
vote
0
answers
45
views
Reject email if From address matches and if content matches as well (Postifx)
I'm trying to setup a rule in my postfix configuration where I check the from address and the email content.
My idea is to REJECT mail if:
From: [email protected]
Content: Hello Test
Is there anyway to ...
- 131
1
vote
1
answer
2k
views
How to stop Backscatter (NDR) from spoofed Mail address?
some one is sending mails from a spoofed mail account from our domain ([email protected]) to hundreds, sometimes thousands of non existant russian E-Mail addresses.
The web hosts send out NDRs ...
- 31
1
vote
0
answers
121
views
A SpamAssassin filter for empty HTML part
A new kind of spam's been getting through my defenses lately with the following common characteristics:
The message itself is of type multipart/mixed with two parts.
The body of the spam is in the ...
- 2,411
1
vote
0
answers
3k
views
Abuse report for an email message from amazonses.com
I'm an AWS SES user.
I'm getting emails from [email protected]
with this message:
This is an email abuse report for an email message from amazonses.com
Based on this Why do I ...
1
vote
0
answers
369
views
Set Postfix to require authentication to send to own domain from own domain
My postfix setup (running in the cloud) successfully prevents relaying, requiring authentication to send to a non-local domain.
However, spammers are sending to [email protected] from someotheruser@...
- 1,852
1
vote
1
answer
1k
views
How to turn on "Release & Allow Sender", and "Block" from End-user spam notifications in EOP
https://docs.microsoft.com/en-us/office365/securitycompliance/configure-end-user-spam-notifications-in-exchange-online states that the spam notification report to users provides the following choices:
...
- 232
1
vote
0
answers
72
views
Postfix - External incoming mails with company domain
We use postfix as internal and external relay and Exchange inside the organization. Our company is receiving a lot of SPAM and phising mails whose Sender is our own company domain.
Searching Exchange ...
- 11
1
vote
0
answers
58
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 ...
- 111