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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15 views

How to figure out if/why/where my mail server has become a spam source?

NB: while I am by no means a mail expert, I've been running my own mail servers since the 90s. I've been self-hosting on AWS since 2011, and have been running this particular configuration since Feb 7,...
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ussd carrier notification block [migrated]

my carrier, vodafone, sends multiple spam popups everyday via ussd, see screenshot below. I am rooted with EdXposed installed. pixel 2xl with android 11 but willing to downgrade to android 10 if ...
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36 views

Risks of custom domain for personal email address?

I am not speaking of hosting the web server myself, I would delegate that to a well established company, for example the registrar I use for the domain name. I want to know what the risks would be to ...
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header_checks is applied to mail body (CentOS 7 + Postfix 2.10.1)

I have received SPAM e-mail, added regular expression to header_checks about it and when tried to forward SPAM e-mail as attachment, then this check triggered and rejected my forwarded e-mail. Regexp ...
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When allowing a sender or sender domain in outlook does that apply to the “via” as well?

The company I work for sends emails for an internal email, but it is sent through a third party service and is authenticated with our domain. Surprisingly, one of our emails ended up in my junk folder,...
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Wordpress limit form submission per IP address

I'm looking a way to limit a form submission per 1 by IP address. The form submission is a 'newsletter' and it is connected directly to mailchimp. I just need a way that if the IP address already ...
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72 views

detect spam from random domain names in header, in .procmailrc

Spam from a well-known organization that sells large lots of knockoffs of everything from drones to roombas uses random domains in the From:, Message-ID:, and Reply-To: fields, all different, without ...
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My e-mail is being used to send spam, what can I do?

I am renting my own domain from a German hoster, and have created 4 e-mail accounts on it. All was well for 5+ years. For about a week now, one of those accounts receives around 5 e-mails per day from ...
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78 views

Outlook live spam filter system

I am trying to migrate my personal email from gmail to outlook (the webmail). So far, easy steps, but I've noticed that the spam filter is very aggressive (or I don't understand it). Even sending ...
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Apple Mail: can I block spammer using `Authentication-Results` header?

I have been getting similar spam from a variety of (probably spoofed) email addresses. Looking at the default headers, I find that the only similarity is in the Authentication-Results header. For ...
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Eliminating the junk and spam folders

I have tried to delete the spam and junk folders on Thunderbird. I have unchecked the adaptive junk in the settings, marked all of the emails as "not junk". The same ones were back the ...
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Recieving spam mail that is addressed to someone else

I keep getting replied spam emails which are being sent to other users. I checked the header and bcc fields, I am nowhere in those. This is the scenario: FROM: spam@spam.net TO: john@doe.net Thing is,...
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How did Google search enter as top item in my Firefox address bar?

Since recently, Firefox (now on 78.4.1esr on Debian stable) is showing me a top-option to enter Google when typing things in the address bar. Needless to say, Google is not my default search engine, ...
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Foxit Reader - How to get rid of the feature advertisement box, which interferes with scrolling?

Just above the scroll bar, there is a rectangular area that I am constantly accidentally hitting, which expands when you place your mouse over it, blocking you from being able to press the top arrow ...
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Stop all emails that contain multiple dots after the @ sign

I look through my junk folder in Outlook, Yahoo, and Gmail, I saw a lot of spam emails. I bet most of you guys probably face these issues too. Ex. wlda44246@mdf9j5dv91qkqi.w352f-a925.kevffsrw.ml ...
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How is it that Email Marketing Platforms like mailchimp are able send emails from me without me giving them my email password?

Mail Chimp, SendinBlue, and etc are email marketing platforms that can do email blasting. I noticed that they are able to send an email and mark it as 'From' my email. Its very weird to me as i never ...
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67 views

Is it practical to run a private SMTP server on a static IP in 2020/2021?

I have a small piece of static IP4 space (5 IPs, /29) and general Linux sysadmin capabilities. I have run SMTP servers before, but I don't know what the current state-of-the-art for email and spam-...
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238 views

POP3 on Gmail doesn't retrieve spam email from outlook

I have pop3 on Gmail but it retrieves emails from outlook only from inbox folder but not from the spam folder. Is there a way pop3 to sent the spam emails (which some of them are not spam) to my Gmail?...
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“This email is from an external mail server etc.” <- can I get rid of this?

On many (but not all) of my incoming email messages, I see a message saying: This email is from an external mail server, be judicious when opening attachments or link My mail server is - ...
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If my emails pass DMARC SPF but don't have DKIM, are they more likely to wind up in recipients' spam folders?

I've set up SPF and it works, but after researching DKIM and generating keys with puTTYgen it turns out my mail server (and domain/site) host IONOS doesn't support DKIM. If I send a test email to: ...
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89 views

How to automatically recognize & move spam emails

There are lots of spam emails in my inbox, but there are also several normal emails and other useful emails among them. Is there any way to automatically recognize spam emails and move them to another ...
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went to link of email with a friends name, but not correct address. now what?

I went to a link sent to me by i thought my boyfriend, i thought it was a joke because it was a storyline about shark tank and a supplement that evens out your blood sugar. Now what do i do? clearly ...
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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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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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1k 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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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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91 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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76 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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197 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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741 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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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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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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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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4k 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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63 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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2k 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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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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327 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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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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798 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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95 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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323 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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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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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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43 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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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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35 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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123 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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215 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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39 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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