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

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0
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2answers
74 views

signed-by in mail header is not added as I have installed and configured my domain

I have checked in http://dkimcore.org/c/keycheck that my site has a valid TXT record for DKIM. My domain is myDomain.com and my selector is mail. I used -t and says to servers to ignore errors and ...
0
votes
0answers
9 views

Five Questions about Specific Examples of Sender Policy Frameworks (SPF) [duplicate]

I have spent some time learning about SPF and have five questions based on specific SPF policies. I obtained the SPF data via http://www.kitterman.com/spf/validate.html In advance, many thanks for ...
2
votes
1answer
40 views

SPF “include:” does MX stay as included domain's MX, or get translated to the includer's MX?

SPF records allow you to include another's domains SPF record within your own. For example, example.com can have include:_spf.google.com in its SPF record to include all of the SPF rules for ...
0
votes
0answers
11 views

Yahoo marked my mail as spam [duplicate]

Yahoo is marking our mail as spam. Mail header says that Domain Key, PTR, SPF all ok. From Abrabos Mon Jan 18 23:41:38 2016 X-Apparently-To: carry.vaillant@yahoo.com; Mon, 18 Jan 2016 23:45:10 +0000 ...
0
votes
1answer
91 views

Apache access log full of unauthorized and suspicious requests, how to take action

I have setup a small tiny VPS for my own website. Since it was live, I see many suspicious activity in the access.log file. When I was on a shared hosting I did not have access to this file and ...
3
votes
1answer
24 views

spamassassin how to remove explanation and score breakdown in the message?

I have setup SpamAssassin in Windows (using the JamSoftware), created a service for spamd.exe and currently SpamAssassin works fine. However, I would like to disable the explanation that SpamAssassin ...
0
votes
1answer
29 views

Exchange 2007 - Sending spam from MY domain but invalid, random users

I'm running Server 2003. Exchange 2007. I've got something on the system sending out tons of spam, and now mostly blocked from the outside world. (We can receive, but not send because we're on ...
0
votes
0answers
7 views

How do I whitelist a spam trigger in a SpamAssassin update channel?

Somehow one of our customer URLs seems to have gotten into some or all SpamAssassin rule sets that are distributed through update channels (we suppose). Mail provider that use Spamassassin mark all ...
2
votes
0answers
72 views

Spam ranking explodes if a certain URL is mentioned in email body - why?

If any email contains the URL lafargeholcim-foundation.org or if an email is sent using an email address from that domain, certain providers rate those mails as Spam, others not at all. It is enough ...
10
votes
4answers
3k views

How I stop spam backscatter rendering email on my domain unusable?

Some miscreant is using non-existent accounts on my domain as a forged sender for spam emails (i.e., sdfhdfsg@mydomain.com). All the out-of-office and spam rejection emails are coming back to me ...
1
vote
1answer
19 views

how do I filter and reject mails in postfix based on the 'to' address

My CentOS server is configured for outgoing mail only. I need a filter to reject mails targeted at selected destinations. For example, if I test with > mail -s "test" spam@trash.com I want this ...
1
vote
0answers
13 views

Email rejected as Spam by Gmail [duplicate]

My domain is apitrak.com registered at gandi.net. For my mail I use Apple Mail and th Gendi.net SMTP server throught SSL. When I respond to a Gmail address, I get an "Undelivered Mail" response by ...
-1
votes
2answers
143 views

How can I reject spam before reaching SMTP on Postfix

My server has started receiving thousands of attempts to use my mail server to send spam from dynamic.hinet.net. The attempts are always rejected, but it's non-stop. I'd like to block these attempts ...
0
votes
1answer
71 views

Postfix Localhost Server Sending Spam to Itself

I have an iRedMail server that runs Postfix and am trying to determine the source of its spam problem. I have since changed the MX records on the domain for the address receiving spam and the good ...
0
votes
0answers
38 views

How to block referral source on apache with special characters?

I've been getting referral spam on my site. I've tried several options to block it, but it still hits it. I think it has to do with being special characters on the referral? This is the referral ...
3
votes
0answers
99 views

Postfix reject_rbl_client Blacklists Not Working

I have a mail server (iRedMail) that uses Postfix. I've been getting a lot of spam, so I modified the /etc/postfix/main.cf file and have the smtpd_recipient_restrictions set to this: ...
-1
votes
1answer
34 views

Add a second IP to SPF record, from an external SMTP server [closed]

I would like to add the IP of an external SMTP server to an existing SPF record, which is looks like this: "v=spf1 a mx ip4:185.6.139.6 a:frey.mailpool.1.netmask.hu a:frey.mailpool.2.netmask.hu ...
11
votes
3answers
3k views

Prevent mail being marked as spam

This is a canonical question about avoiding outgoing mail being classified as spam. Also related: Fighting Spam - What can I do as an: Email Administrator, Domain Owner, or User? What ...
0
votes
2answers
75 views

Postfix sent mails are bounced or go to spam

I recently tried setting up a mail server to be able to send mail for the websites I host with apache. At first I tried to work with exim but I was overflown with error messages and mails I tried to ...
0
votes
0answers
66 views

SpamAssasin FSL_HELO_BARE_IP_2 and RDNS_DYNAMIC error

Why I got FSL_HELO_BARE_IP_2 and RDNS_DYNAMIC error from SpamAssasin? This message was send from an authenticated client (host02-4-dynamic.17-80-r.retail.telecomitalia.it) to a Exim4 server ...
0
votes
0answers
22 views

Emails ending up in gmail spam folder [duplicate]

Emails from my dedicated server are ending up in spam folder in gmail even though the server is not blacklisted and with good reputation - see below. the server level issues that would cause this ...
1
vote
1answer
31 views

Postfix: reject mail, but still deliver or archive in a folder for spam analysis

I'm using Postfix and Spamassassin, and Postfix is rejecting incoming mail that fall into spam rules. Mail are then forwarded to different relays based on many factors. Is there a way to archive ...
2
votes
4answers
392 views

False IP blacklisting on CBL and Spamhaus ZEN

I've gone thru this: Spamhaus XBL keeps adding my IP I'm managing the server 23.239.30.81 on Ubuntu using Postfix. Since last 6 months or so I started forwarding all my: Cron Daemon logs ...
2
votes
0answers
27 views

Does sending mail on behalf of another domain (using a Sender: header) increase chances of being marked as spam?

Our marketing department is contracting with a service that will send email to prospective customers on our behalf. From what I'm gathering from their documentation, it sounds like they do so via the ...
3
votes
1answer
241 views

Should local network host names and IPs be stripped from mail headers?

I'm completely confused about question of necessity/benefit of stripping local network host names and IPs from from mail headers. Two years ago I've found an article which states that modern ESPs ...
0
votes
0answers
7 views

whitelisting mail server with outlook [duplicate]

For some reason, my mail server works with every email address except for outlook.com; I don't know how to fix this issue because most of my country's partners and clients use office365. I am using ...
0
votes
1answer
50 views

Email in SPAM with Debian 8.2 [duplicate]

I have a problem (BIG PROBLEM) with SPAM. All the emails my mail server (Debian 8.2 and ispconfig latest stable) send, end up in spam. I'm using Google Apps. I did a test on spamscorechecker.com ...
-1
votes
1answer
42 views

Spam from my email address on my domain with DKIM

Someone is sending spam emails from my email address. And it looks like these emails have DKIM. How is this can be possible if they doesn't have access to that email? (my emails handles by something ...
0
votes
2answers
48 views

How do IPs end up on the spam blacklists

I don't know if this is the right place to ask this kind of question but here goes. I have 3 IPs on my server, which I'm running for shared hosting. The main shared IP gets blacklisted sometimes, ...
1
vote
1answer
1k views

How can Monitor Linux zimbra mail traffic ( in and cout )?

I configured zimbra mail server in linux. Is there any way to monitor e-mail traffic through linux server. Or any way to monitor spam activities on this zimbra mail server. Thanks for the great help. ...
19
votes
7answers
10k views

Why do 'hackers' setup bots repeatedly fill out web forms?

There is something I don't get, one of my web apps has a small form that allows you to enter you name and email address to "subscribe" to a user list for a site I maintain. The site is very low ...
0
votes
1answer
35 views

How to prevent spammers sending bogus@mydomain emails out of my name [duplicate]

Lately I receive a lot of Delivery Status Notification (Failure) e-mails. Bogus spam email is sent from blablaxx@mydomain to other emailadresses, and bounce back to my catch-all info@mydomain with ...
0
votes
0answers
89 views

DKIM, SPF, DMARC, SPF OK mails are flagged as SPAM

I have a dedicated server running CentOS7 with Postfix, the problem is that all the sent mails are flagged as SPAM by hotmail and gmail despite DKIM, SPF, DomainKeys, DMARC records and keys wich are ...
0
votes
1answer
24 views

How to block referrers that come from specific domain TLD?

Recently I'm getting many hits to my website coming from spam referrers using different domain names and they're all .ru domains. I'm using Nginx on my server. Currently I'm using the below code to ...
2
votes
1answer
1k 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
vote
0answers
222 views

Outlook.com rejects: 550 SC-001 (BAY004-MC5F13)

I am operating a cluster of 3 dedicated machines for a webapp, each of those uses sendmail as MTA. Hostnames are node1.domain.com node2.domain.com node3.domain.com Unfortunatelly outlook.com rejects ...
0
votes
1answer
3k views

I can't send email from my server to gmail addresses

I'm using postfix, and have setup spf, dkim, and domainkeys. I can get my email to go to Yahoo, but not gmail. Here's the headers from an email send to Yahoo. Yahoo reports the email as domain key ...
-4
votes
7answers
7k views

Remove blacklist from spamRATS

I have checked my IP in SpamRATS and the result is the following: Standards Compliance: Does IP Address resolve to a reverse hostname... Passed! Does IP Address comply with reverse hostname ...
6
votes
3answers
2k views

postfix skip spam checks for authorized SMTP

Is there any way to configure postfix to skip spam/antivirus checks for those smtp connections that are SMTP-AUTH'ed? I would like to keep all the standard checks for external smtp traffic, but for my ...
1
vote
1answer
48 views

It's OK to only have SMTP for server-to-server communication?

I'm configuring an antispam appliance to filter mail traffic coming to our Exchange server. The flow will be something like this: ...
1
vote
2answers
150 views

Firewall rule to only allow Postfix to send email through SMTP on port 25

As suggested in How do you detect a spambot on your network? how can I setup firewall rule to allow only Postifx to send emails using SMTP on port 25 and disallow all other applications to send on ...
4
votes
4answers
3k views

How do I spamtrap with Postfix?

How do I setup spamtraps with Postfix so clients that send to trapped addresses are prevented from sending me more spam?
1
vote
3answers
88 views

How can I find out which script/program/user invokes exim (and is sending spam)?

The problem A client of mine asked me to take a look at his shared-hosting webserver for the following problem, but I'm stuck at finding out what's wrong. His server is being blacklisted by a lot of ...
1
vote
0answers
24 views

Setting DKIM and SPF records for client domains

I have created an email server that is capable of handling mail for multiple websites. e.g. tom@website1.com, tom@website2.com etc. The emails are sending and receiving fine, but the spam score is ...
0
votes
0answers
25 views

How to send a lot of emails without tripping the alarms

I need to send couple of thousand emails at once, all addresses are existing users of one domain. I was wondering if that would not cause receiving server to cry 'Spam!' at the sight of so many ...
-1
votes
1answer
49 views

How to improve spam protection using postfix? [duplicate]

I try to improve the spam protection of my postfix install for several weeks now, but I still receive spam. What I've done so far: Added SpamAssassin Added SPF record Tuned rejection rules Now ...
0
votes
1answer
65 views

Email Authentication Report (Scoring neutral)

I'm having some trouble trying to get my company emails to return a better score from Port25s authentication verifier service. I'm scoring neutral on most of the results. I've included the report ...
5
votes
7answers
5k views

phpBB: How to handle spammy registrations?

I'm managing a phpBB-based forum that gets hit hard by spammers signing up fake accounts. To combat this, we enabled "administrator activation required", but it's not working so well: When a new user ...
4
votes
2answers
49 views

Is it OK to run my own mail server for email forwarding? [closed]

A lot of people advise against running your own mail server; they recommend using a SAS that is more experienced in this area (Google Apps Gmail, AWS WorkMail, etc). I want to run Postfix MTA to ...
0
votes
1answer
38 views

Same mailserver, two domains. One domain flagged as spam. Possible causes?

I own two domains, let's call them example.com and mydomain.net. These two domains point to the same ip address, let's say x.x.x.x, and both their A and MX records point to them. They also have SPF ...