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

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12 views

fortimail antispam has blacklisted the internal exchange mail server address

i have an exchange server for which i wanted to redirect outbound messages throught a fortimail antispam box. i created a new send connector for a test domain and used the ip of the antispam as the ...
-1
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0answers
19 views

Change [127.0.0.1] in mail header

I have problem, i need to change 127.0.0.1 to my external server ip in mail headers. Some of spam filters could trigger as it is now. headers Received: from server.example.com (server.example.com [...
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3answers
52 views

mails fom my mailserver go to spam folder of hotmail.com

I set up a mail server with dovecot/postfix on a debian server. I don't send commercial mail or newsletters. We are only 4 users and nobody send SPAM. We only send classical mails (no large pictures ...
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0answers
20 views

Postfix limit total sent per hour

I'm not after services that could provide me with fancy fine-grained control like policyd, I don't need per user/domain control, I only want to: limit maximim number of emails that could be sent ...
1
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1answer
25 views

Email Header too Long

I was told that this would fit here after I put it on WebMasters. I am hoping someone can tell me what would happen if a line in an email header was longer than the maximum 998 characters as ...
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0answers
6 views

postfix body check file content

I come across a strange scenario. I'm using a file containing lines of keywords for postfix to scan so that it can reject spam messages. Now this line causes postfix to think an email containing ...
0
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1answer
33 views

Outgoing spam from postfix using my domains

I get a lot of spam outgoing from my server which uses fake emails but real domains (that are hosted on my server Linux Debian Squeeze). These all have "msg" plus a random number as Email address. ...
0
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2answers
36 views

E-Mail delivery mechanism

Background I am working with email headers for spam detection.Each E-Mail header contains many "Received-from" fields,each "Received From" field added by an intermediate Smtp/Mail server in the path ...
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0answers
31 views

Postfix spam in queue

Recently our company system administrator quit his job and it is unreachable. I was his coleague and helped him with the IT stuff. After he left we noticed our mail system stopped working. So I ...
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1answer
17 views

DKIM with same key but different domains

We are planning to sign with DKIM emails for multiple domains. Each domain will have a CNAME to a DNS entry in a common domain where the keys are stored. If every domain sign with the same key, but ...
0
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1answer
48 views

All outbound emails from my domain get marked as spam [duplicate]

I have a domain, www.duckfox.com, that was using Google Apps mail servers, and now is using Zoho. All outbound emails that I send out will always go to spam, unless that person has already marked ...
0
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1answer
29 views

Mail sent by Postfix / Dovecot setup going into spam folder

I am running a Debian 8 VPS for a couple of months now. I running several services, including a mailserver with Postfix and Dovecot. As far as I can tell, I have everything set up correctly. My IP is ...
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0answers
23 views

Outgoing Messages w/ Empty Sender

I am seeing what strikes me as a strange trend in outgoing mail in my organization. On our Barracuda spam firewall, I noticed in the Top Spam Senders report that our internal Exchange server is by ...
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0answers
20 views

Emails going to spam [duplicate]

For some reason my emails are going to SPAM/Junk on Gmail, Yahoo, Hotmail etc. I have checked and setup the SPF, MX records and even checked many validation tools online - everything appears to check ...
1
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1answer
42 views

Forcibly disconnect spammers

I have Postfix, Dovecot and Amavis on my Ubuntu server. Recently, I get every 4 minutes a connection from IP 155.133.82.96, which appears to be Windows XP and maybe has a virus. Anyway, I found the ...
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2answers
44 views

Blacklisted client: why did Postfix not reject this email?

Answer The best answer was on the postfix-users mailing list and it is summarized here for the benefit of serverfault's users. I had forgotten soft_bounce = yes. Always switch it back to no after ...
0
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1answer
22 views

Route 53 email spam

Since 2 months our email address gets abused by a spam bot. It turns out that emails are send via our info@ email address to thousands of recipients of which many mails bounce back and land back in ...
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0answers
25 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 ...
0
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1answer
40 views

Hotmail is rejecting email from a digital ocean droplet [duplicate]

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 ...
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1answer
52 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, ...
1
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1answer
47 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 ...
0
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2answers
41 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: somestragename@...
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1answer
55 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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4answers
72 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 ...
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1answer
32 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 ...
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1answer
50 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 [email@...
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1answer
39 views

Protecting Distribution Groups [closed]

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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0answers
34 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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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 ...
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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
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1answer
56 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 ...
33
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5answers
585 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 ...
1
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1answer
59 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 12.34.20....
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0answers
64 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 ...
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votes
1answer
27 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
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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 ...
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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 info@exmaple....
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2answers
47 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, ...
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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 =...
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0answers
28 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 ...
0
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1answer
108 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 ...
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0answers
38 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
84 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
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1answer
45 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 ...
-1
votes
1answer
46 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
93 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
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1answer
36 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 ...
0
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1answer
56 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
1answer
46 views

Reject emails from specific address on exim

i have a spammer that is driving me crazy. What i want to do is reject his emails altogether so he receives an instant message saying "message rejected" or similar. Can exim do this? How? Note: This ...
2
votes
1answer
30 views

letting anonymous users use a form to send emails as if it is from their own mailboxes without getting flagged as spam

I am working on a project for an environmental NGO. They want to let users use a form on their website, provide their name, their email address and select certain emails from a list to send complaints ...