All Questions
554
questions
0
votes
0
answers
7
views
Why does the SpamAssassin not insert some headers?
Trying to configure SpamAssassin 4.0.0 with Postfix 3.7.10 on Debian 12. I'm using spamass-milter 0.4.0. My /etc/spamassasin/local.cf has the following entries:
required_score 5.1
...
- 1
2
votes
0
answers
65
views
how to protect postfix mail from gmail spam [duplicate]
I am experiencing an issue with the BDIX (Local Bangladeshi server) server.
I have set up a mail server on the local BDIX server using postfix with aapanel.
I have configured SPF, DKIM, and DMARC in ...
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
0
votes
0
answers
24
views
SPAM and SPOOF emails from postfix mailserver
I created and configured a postfix server, basically its an smtp-only server. I added the domain i want to use in postfix main.cf, and also added other domains in virtual file. I installed configured ...
0
votes
1
answer
80
views
postfix bounce_queue_lifetime and maximal_queue_lifetime
i have done a lot of research but still cannot clearly understand what is the difference between postfix bounce_queue_lifetime and maximal_queue_lifetime in main.cf. Although I've read a lot of ...
- 1
0
votes
1
answer
104
views
Weird email spam issue. Google Domain Exchange email server
We have a client who is blocking our email domain.
Their IT wrote this to us. I've never seen this be an issue before.
You are hosted on Google but have entries referring to Microsoft email protection ...
- 101
0
votes
1
answer
99
views
postfix sending only short messages ( emails ) but not long messages?
when I am sending a short email from "[email protected]" or any other email acc , the message is received well in the inbox of Gmail , hotmail etc , but if I send the message again with long ...
- 209
-2
votes
1
answer
62
views
Spam filters: IP address with no history v. good history [closed]
Zoho gave me an IP address with no history this week. Senderscore.org says there's insufficient data to evaluate it. At other times Zoho has assigned me an email sending IP with a fair or good score.
...
- 3
1
vote
2
answers
420
views
Email message headers pass SPF check after failing earlier SPF checks. Will this result in spam?
I have an issue where email is being marked as spam by Gmail/Google Apps systems.
When reading the mail headers, the most recent SPF check in the mail chain passes, but earlier checks fail. That is, ...
- 181
0
votes
2
answers
582
views
Spammers slipping through SPF
One of the subscribers on the mailhost I run has been receiving scads of spam mail "from himself." With SPF set up and validated on the domain (wickenburg.us) this should not be happening. ...
0
votes
0
answers
24
views
Server still sending spam despite closing relay with postfix [duplicate]
I have an Ubuntu 20.04.5 LTS with multiple Wordpress website running on Nginx.
I installed postfix and configured it to stop relaying emails.
I have an antivirus freshclam running.
Someone or ...
- 101
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
-1
votes
1
answer
37
views
Long established Postfix / Dovecot environ had to be rebuilt, became an open relay; How do I know fore sure it's fixed, and, if not, fix it fast?
Because it's bad form here to ask multiple questions in ONE entry, I'll be asking about specific Postfix and Dovecot entries, however this nightmare has been going on since about January 19 and it's ...
- 1,298
0
votes
2
answers
868
views
How to disable the default RBLs used by rspamd?
I'd like to use an RBL in rspamd without using all the preconfigured RBLs, but it seems that the configuration in /etc/rspamd/local.d/rbl.conf can only add new lists, not remove the default ones.
The ...
- 1,733
0
votes
0
answers
47
views
Rule - Check for an email with an image tag
I hate spammers phising emails, it doesn't contain anything but an image
with in the body.
I'm wondering if there is a rule, I can check if the email body contains only and only <img> and no ...
- 191
0
votes
1
answer
108
views
Managing SPF with multiple users on an email provider
I'm using Ipower for web and email hosting. I was recently made aware that SPF and DMARC were set to neutral, causing all of our outgoing emails to go to spam. I updated both records and they worked ...
- 9
7
votes
2
answers
1k
views
How can I create and update the existing SPF record to allow more than 10 entries?
How can I include another SPF record if my existing domain already has 10 lines of SPF records in the TXT record?
I wanted to add these two:
include:mailgun.org
include:sendgrid.net
This is my ...
- 1,305
0
votes
0
answers
636
views
DKIM: validation error: error:RSA_padding_check_PKCS1_type_1:invalid padding
We receive a lot of spam on our servers from 3rd party servers and often this spam includes the email header such as:
DKIM: validation error: error:0407008A:rsa routines:...
- 217
1
vote
1
answer
638
views
Local Mail Transport Protocol (LMTP) spam?
Our sever receives a fair bit of spam, most of this is standard spam but looking at the headers of some spam we get directly it seems to show that the mail is received by the LMTP (Local Mail ...
- 217
0
votes
1
answer
947
views
How to prevent 3rd party domains using our server/domains for email envelopes
We recently received a whole bunch of notification emails stating an email that apparently originated from our servers was blocked for being spam, but we can't find the source emails on our server, so ...
- 217
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
0
votes
1
answer
311
views
procmail rewrite subject line if email recipient user fails match test
I have a local procmail user "bob".
If an email arrives and matches [email protected], then no action should be taken.
However, if an email arrives and is [anything_else]@domain.com then I ...
- 221
0
votes
0
answers
227
views
GMail Sends Email from .uk.net Domains to Spam
Gmail always puts emails from domains ending with .uk.net into spam, despite SPF, DMARC, and DKIM being passed.
If we send emails from other domains, e.g. ending with .co.uk, from the same mail server ...
- 101
-1
votes
1
answer
611
views
How do I remove my domain from spam lists after abused credential incident?
Recently the email account of one of my users was hijacked to send a lot of spam and phishing mails. Once I realized the problem I did solve it, but only after my domain was marked as spammer by many ...
- 1
0
votes
1
answer
147
views
Google putting all mail to spam
This question is related to some software for schools and one part is for the schools to send information to students and parents. But all mail end up in Gmail spam folders.
If i look at the google ...
- 115
1
vote
1
answer
76
views
Outbound email restriction
We have a project to set up around 5,000 plus email IDs for an educational institution. Emails are meant mostly for receiving mails, and the instituition wants to set up some rule that no email id can ...
- 685
0
votes
1
answer
370
views
How to stop spammer spoofing my domain for emails
I've scanned all my code and even changed the passwords to my google apps account such that the SMTP password has changed. However, spammers are still sending emails from June24-eBay-USA-contactmsg-...
- 302
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
votes
1
answer
446
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?
- 101
25
votes
5
answers
8k
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 ...
- 521
0
votes
1
answer
61
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 ...
- 103
0
votes
1
answer
69
views
Is it ok (regarding spam) to use yahoo to send email from our domain [email protected]?
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 ...
- 133
0
votes
1
answer
152
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?
-2
votes
1
answer
265
views
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 ...
- 109
2
votes
0
answers
1k
views
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
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
3
votes
1
answer
2k
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 ...
- 31
-1
votes
1
answer
62
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 ...
0
votes
2
answers
237
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 ...
- 197
0
votes
1
answer
182
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 [email protected] that I dont have on server2, but this ...
0
votes
1
answer
472
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 ...
- 645
2
votes
2
answers
4k
views
exim - Tainted filename for search - sender verify defer for failed to expand
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 ...
- 67
0
votes
1
answer
39
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.
...
- 1
0
votes
0
answers
43
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 ...
- 171
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
1
answer
929
views
Setting up SPF record for A2Hosting shared hosting
I'm trying to setup A2Hosting SPF correctly since the proposed SPF is landing the emails in the SPAM folder in Gmail.
This is the default SPF: v=spf1 +mx +a +ip4:210.125.99.77 ~all
But when ...
- 121
13
votes
2
answers
16k
views
How does DKIM work when sending emails from multiple sources/servers?
So if I'm understanding DKIM correctly, it basically is a public/private key type of service. However, how does this work if you send emails from multiple servers/sources? For instance, I have a ...
- 141
1
vote
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 ...
0
votes
1
answer
190
views
Why are my Postfix mails recognized as Spam? [duplicate]
I have a Postfix mail that I have configured pretty good. mail-tester.com gives me a 10/10.
I have tested on both Google and Yahoo, and checked their headers. Nothing seems to be wrong in the headers.
...
0
votes
3
answers
835
views
Is mail rejected by Exim's !verify = header_syntax ACL item, with RFC 2047-encoded From/To headers, legitimate?
A recent Exim upgrade added this to the default acl_smtp_data ACL:
.ifndef NO_CHECK_DATA_VERIFY_HEADER_SYNTAX
deny
!acl = acl_local_deny_exceptions
!verify = header_syntax
message = header ...
- 367