Questions tagged [spam-prevention]

Generally refers to techniques that aid in avoiding receiving any email or message that is either unwanted or unsolicited.

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35 views

Do spammers actually make subject lines such as “[SPAM]”? Or is this added by some filter?

I have a Gmail account. Today, I had received a spam message whose subject line was actually "[SPAM]". Is this some new kind of "trick" by spammers, or was the subject line determined to be 100% sure ...
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39 views

antispam PTR checks against what domain

PTR checks the domain IP address to validate sender address. But against what? the SMTP HELO hostname? Or against email domain? for example if I send an email from john@domain1.com from a SMTP server ...
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225 views

Hotmail connected to Outlook - all messages are marked as spam but only from Outlook

I have an issue where by a colleague has a hotmail.com account, which has been upgraded to a premium one recently. This is connected to Outlook 365, alongside his corporate Office 365 email account. ...
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27 views

Outlook strips out safe senders

I am a software engineer and wrote a Web API that has system generated mail messages that get sent when a user "requests more info" on the website. This generates 2 messages, one on the requester ...
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61 views

My business email suddenly goes into spam with majority of people I email for the first time

The email that I use in the business correspondence goes to the spam (Gmail, Hotmail, Yahoo) for the majority of people that I email for the first time. To be clear, I am not involved in any kind of ...
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88 views

Postfix fallback to another SMTP in case of blacklist

I am managing a postfix+dovecot mail server with a few hundred email accounts. We are doing our best effort to filter spam and viruses in inbound as well as outbound emails. Nevertheless, it happens ...
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73 views

What would be a safe way to block these SPAM e-mails? [closed]

In the last month, I've been getting numerous e-mails which all follow a clear pattern (well, it's clear to a human eye, at least). They are sent from e-mail addresses such as: amzn.2.gmsu.70155@...
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117 views

How does the use of port 587 stop spammers?

I see that that ISPs are starting to push users to use SMTP port 587 instead of old port 25. Spam usually appears in the ISP's reason for this need. My question is "how is this going to stem the spam ...
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720 views

Spam Email from me to me

I have just received an email with the from address being the same as my own email address but Google has correctly classified it as spam and it went straight to my Spam folder. The content of the ...
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2answers
70 views

what's the difference between using RBLs and anti-spam software?

My doubt is, is it too different to use RBLs instead of anti-spam programs? (like SpamAssassin) I've a Postfix + Dovecot server with some RBLs in Postfix, and disabled SpamAssassin because it was ...
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29 views

How to filter an email type to prevent it from occupying even the spam folder? [closed]

I receive daily messages in my Gmail with the same subject: "Sales Boom". Gmail correctly detects these messages as spam and sends them correctly to the spam folder. Even so, I would like to know if ...
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38 views

Postfix is forwarding/relaying spam

I have an Ubuntu 16.04 machine with Postfix 3.1.0 and virtual mailboxes (iredmail). I'm using postscreen (with a local Bind server), Amavis with ClamAV and SpamAssassin. The amount of received spam ...
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96 views

Spamassassin whitelist dosen't work

I have spamassassin on a ubuntu box and I configuring an score of 2.0. All good but one email it's identified as spam and I want to whitelist that domain's email. So, I config: /etc/mail/spamassassin/...
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23 views

How can I use the results of SpamCop in Thunderbird by SpamAssassin?

In the past I used gmx.de, a Web-email-provider in germany, only. But I got many spam mails, so started to fight against it by reporting it to SpamCop. First I had to learn is, that gmx.de does not ...
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89 views

Microsoft flow “send email with options” failed because of the G suite Spam filter?

We met with a problem when we send out emails from office 365 and Microsoft flow. In our flow there is an operation that will send out an email with two links, one will send an "approve" message back ...
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47 views

Why reCAPTCHA v2 lets SPAM through on my woocommerce webshop?

My Wordpress WooCommerce webshop developed a spam problem. The spam is not displayed but affects public product rating and therefore quality of google search results. The thing is I am not able to ...
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1k views

Outlook POP3 cannot receive Junk mail folder, how to work around this?

I have identified a misconfiguration in the way e-mail is set up at my workplace. We use POP3, and the accounts at our e-mail provider are set to move spam to a Junk mail folder. I have just learned ...
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53 views

Can certificate issues cause your IP to get blacklisted by spamfilters?

I have been googling on this topic for over a solid hour now and can't seem to find an answer. At my work, all employees get the following (good old) warning whilst firing up their Outlook clients: ...
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265 views

How to leave a Google Shared Drive that I'm not editor

Today I opened my Google Drive and a Shared Drive with the name ### Get a $1,000 Per Month appeared. This drive has only one file in it, a Google Slides presentation named Get a $1,000 Per Month. ...
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45 views

Is there any way to filter emails using source code?

I have an IMAP email account, and I get quite a bit of "click this link to see me naked" style spam. There's nothing consistent in the text, TO or FROM of the messages that I can use to filter them, ...
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3answers
86 views

Strange activities involving fake email address within a domain of mine

I am currently experiencing something that might be construed as an attack, and am wondering what, if anything, I should do about it. First, a bit of background. I am the long-term owner of a .com ...
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1answer
231 views

Where does thunderbird store the training data for its adaptive junk mail filter

Thunderbird has a junk filter which can learn as you mark more and more mail as junk. I want to know what is the name of the specific file in the thunderbird profile containing the training data of ...
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39 views

What is smtp-relay.gmail.com send limit in 2019 when used as a POSTFIX mail sender?

There's no official google statement where they state on how many emails can be sent through smtp-relay.gmail.com when using it as the main mail sender in a POSTFIX server. Many of the reports before ...
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39 views

Replying to an email with a + extension

I sign up for accounts using “myemail+customextension@host.ext” and this is all fine and good. I just want to know how to reply to emails using that custom extension rather than “myemail@host.ext”
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357 views

Run junk mail filter on inbox

I currently am running outlook office 365 ProPlus I simply want to run the junk mail filter that comes with outlook against all the existing emails I have in my inbox. It only applies the rule on new ...
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73 views

Exchange 2016 x Cannon scan - Message rejected as spam by Content Filtering - sometimes

I am running Exchange 2016 and I am facing a trouble with scanned emails from Cannon scanner. Emails from customers scanner with scanned pdf file are blocked by my exchange 550 5.7.1 Message ...
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134 views

How to hide email recipients without BCC/spam

Silly question, but I have emails that I want to send to several people at once. But I don't want the recipients to see who is included in the email, as the material is somewhat sensitive. However, ...
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39 views

Most effective way to get rid of existing spam mails in thunderbird? API? [duplicate]

I have my own mail server (hosting package) on which spam assassin is installed, which basically does no help at all. I get a LOT of spam mails, between 50 and 100 daily. All from a different sender/...
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24 views

Guarantee email deliverability

We are using Zoho Mail in our company and so far the experience was great. But recently we have faced an issue of not getting our emails delivered to the new company we are now working with. One of ...
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2answers
38 views

Gmail and others recognize my emails as spam

I have mail set up on VPS. Everything checked 10x. Dns entries, testers, open blacklists etc. etc. and all my messages are sent to spam :( Why? Here are the results of online tests - it's look fine ...
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85 views

Why do parts of a Spam Email disappear, when I move the email from the Junk Folder to any other Folder; including the Inbox folder?

I have received a Sextortion/Extortion email, via my Hotmail Account, which landed in my Junk Folder. The email basically claimed that they had accessed my computer where they had obtained vulnerable ...
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28 views

Avoid backscatter with aliases

I have a pretty standard exim 4.90 setup of type "internet". Since a few days, this server has been added to the backscatterer blacklist. After analysing the logs, I found the problem: I've received ...
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179 views

How to track down Chrome spam popup enforced by an extension?

I've got an extension that forces GMail advertising popups that I want to remove, but am unable at the settings page: I tried disabling my extensions, but it still was enforced. What is the globe ...
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1answer
34 views

This IP was already used for a trial - spaming admin email

I use amazon lightsail and I get a lot of generated emails saying: "The IP .... was already used for a trial license on 2019-03-13" Where the IP changes to different IPs. The emails are from my cron ...
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1answer
95 views

Emails are automatically sent to Chinese addresses - scam/spam/virus?

My IT-colleagues have noticed that a (non-IT) user in our work network has some strange things going on in her mailbox. In the user's sent folder we noticed a bunch of emails with all Chinese ...
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1answer
105 views

Block emails from TLD on Outlook 365 w/o Junk, 3rd party programs, or scripts?

Is it possible to block an entire TLD in Outlook 365? I've been getting a ton of spam emails lately, and I want to set up rules to automatically delete them. I set up a rule to block certain TLDs, ...
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36 views

Once a wide variety of spammers have an email address is there any way to recover it without using aggressive spam filtering

When I first set up my email address I got very little spam. I am not a fan of spam filtering in general and I prefer to manually check the spam; however I made some mistakes over the years including ...
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23 views

Spam Filter Blocking or something on users side of things?

Spam Filter is designated some email as blocked. This sender has sent us email in the past. The reason it was blocked was: "Domain of tbu****s@mc**-ar**.com does not designate 54.2*8.***.9 as ...
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1answer
25 views

What authorizing entity excludes your e-mail to be tagged as spam?

Right now we have this project that periodically sends e-mails to more or less 16,000 people. These emails are work related and the recipients need these e-mails for their work. I have read somewhere ...
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18 views

External hard disk showing 0 byte files and folders [duplicate]

I have a problem... I accidentally unplugged my 2 TB external hard disk without safely removing it. After that whenever I plug in the external drive it only shows file names and folder names with some ...
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3answers
82 views

Understanding Bitcoin addresses

I see a lot of scams listing bitcoin addresses to pay money into, and I'm wondering how feasible it is to block some instances of spam based on these addresses, but I confess to having only a passing ...
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1answer
25 views

How to get my Debian server delisted from RBL

My server running on Debian 7 (wheezy) was listed on an RBL (Realtime-Blackhole-List) for spamming email (twice). I have changed root password, installed spammassassin, reconfigured postfix to ...
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2answers
157 views

email marked as spam even with DKIM, SPF and DMARC headers

I've configured a Postfix + Dovecot email server. I took care of SPF, DKIM, DMARC and added appropriate headers to the message. I haven't used the machine for 2 years, so it can't be blacklisted from ...
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1answer
87 views

Odd spam from a named contact but incorrect email address

This morning, I received an email. This is a screen shot. I keep getting emails like this. The original forwarded email is from a real friend. The From and To are accurate email addresses. However, ...
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26 views

How do I make Thunderbird automatically mark as spam all emails which have any emoji characters in subject line?

This year I've started receiving spam emails which are very easily identified by containing emoji symbols in the subject title. I tried filtering them one by one, but the spammers just keep using new ...
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41 views

How to effectively filter spam emails that have two '@' symbols in the address?

Apologies if this has been addressed before. We are seeing a companywide uptick in spam emails with attachments that use the following syntax for the 'From' email address (I apologize again that this ...
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100 views

Outlook 2016 Pro Plus Digital Signature issue

in my organization there are 50 clients, circa (Windows 10). On 8-10 of these, there's a single mail account configured with IMAP in Outlook 2016. From 15/10/2018 some emails from inbox automatically ...
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2answers
291 views

postfix/dovecot, other domain is using our server to send spam

Our server is being used to send spam from an account that doesn't belong to our domain. This account is sending emails to other domains and it is affecting our IP reputation. log: Nov 20 06:31:42 ...
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1answer
1k views

Work emails going to recipients SPAM folder instead of inbox

I am having an issue with emails coming from my employers email domain (@poweron.com) ending up in recipients SPAM folder instead of their inbox, here are the details. On monday, the sales manager ...
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2answers
13k views

Group policy to block office macros

my organization has a windows 2016 server standard edition and i'm wondering how to go about adding a group policy to block office macros. I've seen a lot of other posts using user config > ...

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