Questions tagged [spam]

Unsolicited e-mail, comments or posts, often sent out in large volumes; possibly but not necessarily commercial in nature

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14 views

Spam filters and emails: Galaxy hosting and GoDaddy

I am sending emails from my app on Meteor Galaxy. I have the domain name registered at GoDaddy. All my emails are ending up in the spam folder at the recipient. I have looked into this a bit, ...
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Configure Postfix external relay for UCEPROTECTL3 rejection

Is it possible to configure MTA Postfix server to bypass UCEPROTECTL3 rejection ? Example when my server connect to recipient server then I get information: Diagnostic-Code: smtp; 554 5.7.1 You are ...
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23 views

What to do if a specific postfix/dovecot user's account is hacked and being used to send spam?

I'm running a postfix/dovecot mail server. This morning, I discovered it was unresponsive. Turned out, /var/log was full. It appears one of the users has had their account hacked and it's being used ...
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How to define word filters on rspamd

I have a list of "badwords" that if a mail contains them, the chance of it being spam is very high. But I am hitting a wall here. I've tried the following configuration, but it doesn't seem ...
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27 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 ...
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37 views

DKIM validation fails only on Outlook

I'm configuring OpenDKIM to sign miltiple domains with the same key on Pstfix. I followed this tutorial with s=mail and d=example.com. SigningTable: * mail._domainkey.example.com KeyTable: ...
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31 views

Is it possible to scan local drive folder for SPAM Mails? [closed]

I want to check a postfix mailbox folder directly on the Server. The server OS is Debian. Is this possible?
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41 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=<...
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What is the option in Postfix to get a maximum of one report of failed emails per day?

I have a website which once in a while gets spammed by robots attempting to create accounts. As a result, the website sends an email and very often that's either a fake email or that mailbox was ...
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11 views

Discard an email in postfix when the reply-to address is different from that of sender

I've setup virtualmin and the emails are working fine with the Postfix server. However I'd like to add a feature where, in case somebody tries to abuse the server and tries to send an email with a ...
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21 views

Does changing DNS provider affects email reputation?

Example: Moving from Cloudflare to Route 53. Keeping all records the same. Would that affect email reputation?
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3k views

Does DKIM alone not solve the spam issue? Why do I need SPF?

FINAL EDIT : I was completely wrong about DKIM it seems, the signing domain does not have to be the same as the sender domain, thus the whole premise for my question is flawed. A lot of thanks to Paul ...
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1answer
39 views

What is a good way to send user-generated newsletters/emails to thousands of subscribers?

I know many services these days are doing newsletter,example - Mailchimp, Revue, MailerLite. I'm very curious to know how do they manage to send that amount of emails and not being shutted down by ...
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29 views

Is it ok (regarding spam) to use yahoo to send email from our domain me@mydomain.com?

I m enough of seeing my email arriving in spam folder. I would like now to send my emails not from my smtp server but from yahoo mail server. When you have a yahoo account, you can choose to send ...
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60 views

Allowing Messages from IP Address DMARC

I'm still learning infrastructure stuff and need to ask a question which relates to DMARC. A user in the organisation has an app which is sending marketing messages to staff within the business. The ...
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1answer
43 views

Compare url link and url text in email body and reject as SPAM

Email body: ... <a href="url">text</a> ... Is it possible check if text is url in email body, then compare url and text and reject as SPAM if they differ?
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1answer
77 views

How to analyze cause of postfix server sending spam

A client of mine has a server hosting postfix as well as nginx with several websites, including an nginx installation with several subdomains / websites. Since a couple of days the /var/spool/postfix ...
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Identifying the spam source on my Centos6.9 smtp sendmail server

The server has also httpd with PHP services running I did read the guide here: https://a1websitepro.com/find-track-filthy-spammer-block/ I did install EXIM My client complains they never had this ...
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My postfix is used for spamming [duplicate]

I need your help. My postfix is sending spam mails. I checked my main.cf and it should be fine. In the following a snippet of my mail.log Jan 3 22:35:41 mail postfix/pickup[104179]: 866352963F01: uid=...
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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. <real@example.net> (...
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47 views

Postfix: How to malware & spam scan outgoing SMTP SASL auth users?

Although I have found two answers to this, I can't work out how to actually implement them, and at least one of them doesn't actually answer the question. So if anyone has any experience to share I'd ...
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2answers
64 views

Postfix - How to enable SMTP authentication on local delivery

I have an email server running Postfix. Everything is working fine, However, recently, some internal emails received emails from their own addresses with phishing content. After finding out, I learned ...
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96 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 ...
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1answer
310 views

Spamassassin working but not learning? Bayes-filter accuracy is not improving

I have a mailserver with a working spamassassin installation (postfix, dovecot, amavis, clamav, spamassassin on debian). Everything is working great. Spamassassin is filting out Spams and I get the ...
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26 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 ***...
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32 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 ...
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702 views

Postfix - Relay access denied, disconnect from unknown IP, RCPT from unknown IP spameri@tiscali.it

I have Postfix installed in my cloud server. I got tons of warning in my mail log: Nov 26 18:37:56 ubuntu-4gb-fsn1-1 postfix/smtpd[66066]: warning: hostname ip-113-120.4vendeta.com does not resolve to ...
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2answers
163 views

Postfix does not retry after 451 error / greylisting

I have a forwarding server using postfix/dovecot that receives emails from a third party mail client (say gmail) and forwards the emails to the final recipient. I have noticed that when the recipient ...
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63 views

EXIM relay_to_domains if host is on the relay_from_hosts list

I have setup relay for using a hosts list & a domain list. Yet it seems my EXIM is relaying other hosts too for the relay_to_domains list, which is unwanted. Please advice if this adjustment would ...
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3answers
163 views

How to delist DNSBL?

Can not send email to some email addresses that it looks like they are using Office 365. The NDR message is coming from DnsConnectorDelivery which is: [{LRT=11/6/2020 12:11:09 PM};{LED=451 4.4.0 ...
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54 views

How is it possible for spammers to keep pestering me with FAKE domains when all e-mail sending providers have these insane obstacles to go through?

I keep getting e-mails to my Gmail account from made-up domains such as: @mtixusu9shbyusyr6.org.uk @mpqyriexqpvramtkn.org.uk And so on... (Yes, I checked some of them and they are not actually ...
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Provider for outgoing mail from own Postfix server

I've been running Postfix on my own dedicated server (hosted by Hetzner) for years, however, it's getting increasingly difficult get outgoing mail to Outlook/Hotmail and sometimes Google delivered. ...
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92 views

SpamAssassin and Amavis block by country/IP/ASN per-user

I have a spamassassin-3.4.4 install with amavisd-2.12 and postfix on fedora32 and would like to be able to block email from an entire country on a per-user or per-domain basis. What is the best way to ...
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17 views

Postfix - how to deny 'anyone' from spamming local recipients [duplicate]

I managed to configure submission smtpd with auth and tls on port 587. Smtpd on port 25 can receive mails, but local recipients may be spammed by fake addresses (e.g xxx@xxx.xx can send a message to ...
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27 views

How to reject attachments with accents - Postfix mime-header-checks

currently my Postfix mime-header-checks config are rejecting attachments from spammers, it's working, but today I discovered that messages with attachments that have accents in the file name can pass ...
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1answer
250 views

DKIM Key Rotation Best Practices

Do you find it necessary to regenerate your DKIM keys every 1-6 months to avoid your mail going into the receiving servers' junk mail folder? Some guides recommend this, some even say it's "Best ...
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2answers
52 views

Suspicious Exchange message queues filling up disk space

So i came across my HD space getting full too quickly and after doing some inspecting with wireshark and powershell. It seems my email server is being used as a relay for spam. I closed port 25 on my ...
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29 views

Spam filtering based on average ascii score

I'm trying to come up with a new spam filter based on what has been coming through our filter lately. A lot of the messages have subject lines like: "Re: ᴢᴀɴᴛᴀᴄ 【ʜᴀs】 ʙᴇᴇɴ ʟɪɴᴋᴇᴅ 【ᴛo】 ᴄᴀɴᴄᴇʀ&...
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1answer
37 views

How to send an email on behalf of user

I have two zimbra mail servers, on server-1 I have one domain with accounts. I want to be allowed to send email from server2, on behalf of account@domain.com that I dont have on server2, but this ...
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24 views

Apache “ghost” requests?

I lack the ability to formulate my problem, otherwise I'd probably find the solution. I notice there are quite a number of pointless requests in my access log :~/$ cat /var/log/apache2/access.log | ...
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1answer
121 views

How to address spam bounce on exceeded quota issue?

I'm investigating a mail server blacklist issue. Our mail server had a user over quota, which resulted in emails being bounced back to senders with a"user over quota" message. Some of these ...
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1answer
34 views

Lots of exim4 notifcations due to failed sender verification

My exim4 server rejects a lot of spam emails due to failed sender verification. However, those result in lots of frozen messages, which in turn spam my postmaster inbox. Example line from exim log: ...
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940 views

emails to Yahoo are ending up in SPAM folder despite spf=pass, dkim=pass and dmarc=pass

Are we possibility having a reputation problems with Yahoo emails? Yahoo raw mail header finds my policy I published: dmarc=success(p=REJECT,sp=REJECT) Emails to clients at Google and Outlook are not ...
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56 views

Plesk and postfix best mail limit

I have a server with plesk onyx and postfix. On this server I have 5 domains and every domain sends newsletter to 7000+ users. Some days I can reach over 15000+ outgoing mail. I have set postfix with ...
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1answer
47 views

Postfix seems to ignore spam miltering for LMTP

I use SpamAssassin through a milter to check e-mail, but it seems postfix does not check local delivery (like contact forms). How can I force Postfix to treat all mail as 'foreign'?
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1answer
54 views

Cyren (Zxyel) classified my fresh website as a “Spam Site”. I have never hosted a mail server. What now?

About a month ago I bought a cheap VPS from a popular provider, and also bought a new domain name for it. It hosts Nextcloud and TT-RSS, and I have never sent an email from it -- yet on http://...
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1k views

exim - Tainted filename for search - sender verify defer for failed to expand - zen.spamhaus.org: No address associated with hostname

discovered today this mailserver problem, and because have not written exim myself, can't debug it X-D also: is this normal? host zen.spamhaus.org ping zen.spamhaus.org ping: zen.spamhaus.org: No ...
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1answer
19 views

PTR recored Issue

We have 2 Mail servers ( Internal and External) the External is hosted by ISPA with ip address of 62.xxx.xxx.xxx, we use to have the internet from the same ISPA, and the PTR record is already setup. ...
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32 views

How do I ensure that only my e-mail server is sending e-mail through my network?

This is a follow-up to Our IP was listed by Spamhaus - how can we prevent this from happening again? - unfortunately, it is happening yet again. I was thinking that people could have malware on their ...
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50 views

google apps domain gives diffrent servers when emailing out then mxtoolbox search shows

When I search a domain that uses google apps I get 10 results mx servers for the domain. similar to this alt1.aspmx.l.google.com alt2.aspmx.l.google.com when I recieve emails I get completly ...

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