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

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1answer
21 views

Hotmail is rejecting email from a digital ocean droplet

I have setup my site on Digital Ocean and point the Domain name "A" record to the Droplet IP. Emails sent by the site are being received in Gmail and other email clients ( SPAM Folder ) but it does ...
0
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0answers
9 views

Exchange 2013 -Prevent Spam emails from outside but with my internal domain name

my apologies if this question was asked and answered previously. we have Exchange 2013 email server. We have been seeing some of the emails are coming from outside but using our own domain name which ...
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0answers
37 views

I think My Email Server Got Hacked [on hold]

Hi almost everyday my mail server is getting relentlessly attacked. Because of that, several of my users send out spam email without their consent. I've already setup fail2ban but they're kept ...
0
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1answer
36 views

Spam sent from my dedicated server Centos/Postfix, no idea on how to block people from connecting

I've been reading a lot of topics here for the last 2 hours, made some change and yet I'm not sure how things happened and if things are fixed. First, this morning, I received an email from OVH, ...
2
votes
1answer
141 views

Dealing with spam flood in Postfix + Amavis

I run a mail server for several thousand users. It uses Postfix + Amavis (with SpamAssassin + Clam). Most of the time it's a pretty happy setup, but from time to time we receive a flood of ...
0
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1answer
38 views

Domain is being used for spam - what to do?

I recently started to receive postmaster and mailerdaemon mails about undelivered mail that have been sent from my corporate domain. It's default spam: attached files/invoices/etc. and it's not coming ...
2
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1answer
2k views

How can I prevent spoofed emails from outside thats using my internal accepted domain

I'm receiving spam emails sent from my own domain to my own domain. I'm using Exchange 2013. Example: myemail@mydomain.com is being used to send spam to myemail@mydomain.com. I can successfully ...
1
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1answer
1k views

How to find which local process is sending spam on a Windows Server 2008 server

I am managing a Win Server 2008 system with a number of hosted web sites. Recently I found that something was sending spam through our SMTP server. The logs indicate that the connections were being ...
33
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5answers
554 views

Is it becoming impossible to be a small mail provider?

I operate a small mail server for my private emails, some friends who have websites and two NGOs. In total my server sends between 60 and 400 messages a day. Now a lot of these emails are personal ...
0
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2answers
28 views

Postfix Catchall - Avoid Spam

I've 2 accounts on my CentOS server configured with catchall email accounts. Lately I've been receiving bounced emails with virus that were supposedly sent from my server account, Ex: ...
-2
votes
4answers
50 views

SPF, CloudFlare, Google Apps - Email sent through Contact Form marked as spam

One of the main reasons of putting your server behind CloudFlare is to hide your server's IP address so an attacker can't DDoS your IP and render CloudFlare obsolete. By putting your server behind ...
0
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1answer
47 views

Mail Server allow sending spam to own domain

I am having trouble configuring my mail server (Dovecot and Postfix). The problem is that someone can send spam mails to my address from my own mail server. The server is not open-relay but it seems ...
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0answers
7 views

Mail marked as Spam in Live services (Hotmail/Office 365/Exchange etc.) [duplicate]

So I have my own custom domain with my own mail server, all my outbound e-mail goes through Mailgun.net with working DKIM/SPF and subscribed to all Microsoft services (anti-spam bullshit program). ...
4
votes
1answer
5k views

Exchange 2003 mail non-delivery (NDR), spam activity? events 7002 & 7004

Windows Server 2003 Small Business Server SP2 Exchange Version 6.5 (Build 7638.2: Service Pack 2) This network has been neglected and has been having email problems for years and was on many ...
0
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1answer
37 views

Protecting Distribution Groups [on hold]

Problem A number of our AD distribution groups have recently been receiving spam from outside our network. These distribution groups are open to receive mails from outside of our network as we work ...
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votes
1answer
27 views

My Email Strightly goes to gmail spam/just folder ( DKIM,SPF,DMARC is okay ) [duplicate]

( it's not duplicate , its related to rDNS , please don't flag it as duplicate or give me the link of related one ) i have a problem, my emails from my mydomain.com straightly goes to spam folder in ...
0
votes
1answer
40 views

recipient address rejected - helo/hostname mismatch

there, I'm in a bit of pickle and was hoping someone could provide some assistance. I have a mail server, [sending.server.com] trying to send to another server to [target.server.com] from ...
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1answer
7k views

Exchange 2010 email spoofing prevention

Masters, Unfortunately we got some spam mail which seems to be coming from our own domain. I found some article which all says to remove Anonymous login from internet receive connector ...
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0answers
27 views

Exim restrict send emails only from predefined list of emails

I use Exim MTA. I need to restrict hosting (lamp) send emails only from predefined list "From:" emails per user to prevent massive spam if website was hacked. Users use php to send emails via builtin ...
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votes
4answers
12k views

How to report spam to blacklists

Is there a central place to report spam to various blacklists ? I regularly report to spamcop, but I do not see the addresses I reported as listed. (I guess nobody else bothers with my regular ...
0
votes
2answers
668 views

Prevent server beeing flooded with requests

I'm hosting a Wordpress-blog on an Apache server (shared hosting). For some reasons I've been receiving like 100 requests per second to xmlrpc.php for a few days. The access.log looks like this: ... ...
3
votes
2answers
3k views

All External Mail to Office 365 Fails SPF, Marked as Junk by EOP in a Hybrid Deployment

In short: legitimate emails are landing in Junk folders as EOP (Exchange Online Protection) stamps email messages as junk (SCL5) and SPF-failed. This happens with all external domains (e.g. ...
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vote
0answers
21 views

How I can look from that script runs sendmail?

my problem is that some script in php or some other script or program is sending spam. I am not able to trace where this program runs. do the following: ps aux | grep sendmail nginx 28286 0.0 ...
0
votes
0answers
9 views

What's a reproductable way to set up a Linux server for sending e-mails but no spam? [duplicate]

I've created a software that has to be installed onto a Linux server and from time to time it has to send a notification email. So, for people who want to use my software, I've created a bash script ...
0
votes
1answer
40 views

Exchange server 2016 Content Filtering

I have setup an exchange server on premise with at SMTP Relay on our VPS. It works very well, unfortunately I’m a little confused as to where I setup the various permissions for SPAM. All my incoming ...
0
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1answer
62 views

Using DKIM in my server for multiple domains (websites)

As I couldn't find this exact tutorial in Stack, I share my findings with al of you. I always get things solved thanks to this comunity. Thanks! Original question: I've read the tutorial posted by ...
1
vote
1answer
55 views

Spam filtering: MX record and reverse DNS (PTR)

If I perform an MX query on my domain (domain.com) I receive this answer: Pref Hostname IP Address 5 mail.domain.com 12.34.20.145 If I perform a reverse DNS (PTR) query on ...
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0answers
39 views

PHP Script sending spams and mail.add_x_header not working

I've got my server hacked lately by some Php64 malware. Since then, I have found a lot of PHP files in my /var/www sub-folders. I am trying to delete each of these or clearing the files when some ...
0
votes
2answers
46 views

Someone sending email through my Postfix/Dove

there might have been answers to this many times. But I can't seem to find one that fits my issues so here we go: I've ran an email server on my centos machine for over four months without problem, ...
-1
votes
1answer
24 views

Why are some spam emails addressed to hexadecimal addresses?

I've run Postfix to host my domain's email for years now, and generally I've reduced spam to an acceptable level (including use of greylisting, SpamAssassin, and DNSBL). One thing I've never figured ...
0
votes
0answers
7 views

Using mail.domain1.com for domain2.com mail server? [duplicate]

I have a Linux CentOS machine, and 2 domains hosted on it: domain1.com domain2.com Is it safe to use one mail server for both: mail.domain1.com? If I use mail.domain2.com, I have problem ...
0
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0answers
16 views

Google puts my mails to spam [duplicate]

I have a mail server with proper (I think) configuration, but Google puts my mails to the spam folder. I see the following error in the source: Received-SPF: fail (google.com: domain of ...
0
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0answers
15 views

Postfix mail always in spam [duplicate]

I've installed and configured postfix trying to find the best way on the web. This is postfix main.cf: smtpd_tls_security_level = may smtpd_tls_received_header = yes smtpd_tls_session_cache_timeout ...
0
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0answers
27 views

Can I use Spamassassin to classify text-only content?

I wish to know if I can use spamassassin classify text-only content? Right now I'm using the following command: spamassassin hello.txt But I'm getting the following warnings: 1.2 ...
6
votes
2answers
14k views

Postfix check outgoing mail for spam

How can I force postfix to check (and log/flag/etc) all outgoing mail for spam? Just want to make sure I'm doing my part on my servers. EDIT: Postfix config, as requested. main.cf # See ...
1
vote
2answers
43 views

Is DMARC helpful to me if I don't need reporting?

I have SPF and DKIM setup and working for the email domain I administer. The next recommended step is to setup DMARC since SPF and DKIM are both in place. What are the benefits of using DMARC if both ...
0
votes
1answer
104 views

Postfix sending spam to local email addresses without authenticating

Running on Centos 6.4. Past two weeks I've been receiving emails from other email accounts located on our server. admin@site.com is sending to careers@site.com and nonexistentemail@site.com is sending ...
1
vote
2answers
1k views

why my mails from zimbra server to yahoo goes in to spam folder

I just configured zimbra mail server but mail from my zimbra to yahoo, hotmail etc going into there spam folder any suggestion??? bellow is header part from yahoo of that mail X-DSPAM-Result: ...
1
vote
0answers
36 views

Postfix send SPAM

I come a few days being listed in the Spamhaus CBL. CBL list reports that I have a virus on the network and that is sending emails as "localhost.localdomain". I do not know where to be coming this ...
0
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0answers
59 views

SpamAssassin: avoid FREEMAIL_REPLYTO on Contact Form

Suppose: someone fills out my contact form on www.example.com/contact/. My server-side script sends this information to a sales person at the organization. To make SPF work, I set the "From" as ...
0
votes
1answer
42 views

How do I tweak spamassassin scores on Ubuntu Server?

I'm wondering what's the right way to tweak scores for Spamassassin's builtin rules. I know how to edit /var/lib/spamassassin/3.004000/updates_spamassassin_org/ but that doesn't feel right - my ...
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votes
1answer
43 views

Why does Google junk mails from my server? [duplicate]

I have a send-only mail server setup on an Ubuntu VPS. The mail server is only used to send out registration e-mails from a web application. I have the following configured: DomainKeys Identified ...
3
votes
2answers
85 views

Understanding exim4 outgoing message logs. Am I a spammer?

Today I got many spammy emails into my mailbox, I looked in exim4 logs and I found some suspected activities. I would like to understand the serverity of this attack, if I got spammy mail I can ...
1
vote
1answer
645 views

Adding mail header if postfix DNS based RBL (realtime black hole) check fails

I have setup a receiving Postfix mail server. Here i have custom code written that parses the whole mail received by postfix and use the headers, body and attachments separately for different uses. I ...
3
votes
2answers
2k views

What does the email header “X-CAA-SPAM” refer to?

I've got an application that sends out notification emails to users of the application (this is not spam; the information in these emails is solicited and useful, and is also a feature turned off by ...
4
votes
3answers
473 views

With valid SPF my mail header becomes huge -> high spamassasin score

I have a dedicated server with a survey system running on a subdomain. The parent domain is hosted on another server. I send email via google apps. Reverse DNS is correct. Without SPF og DKIM, the ...
1
vote
1answer
33 views

Postfix Hostname domainbased

I would like to excuse in advance, if my question has already been answered before but im going crazy since a week now... I'm not new to this but after a while in another job, my "skills" are totally ...
2
votes
2answers
2k views

All headers pass, hotmail still marks as spam [duplicate]

Possible Duplicate: Why Does hotmail still reject my emails? So I've been working a long time on fixing the Hotmail issue, but nothing seems to work: Created my SPF records with the ...
0
votes
1answer
48 views

SPF in hotmail are not used [duplicate]

I have a problem with Hotmail provider, all mail sent from my server goes to SPAM folder. I Have added a correct SPF to my domain example.com but into the headers is not used (spf=none) and the token ...
0
votes
2answers
301 views

Postfix Header Filter

I have set up a header filter in postfix to discard messages from Russia and Romania because of the volume of spam coming from those and we do not currently do business in those countries. My regex ...