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

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8
votes
6answers
13k views

All my emails to Yahoo!, Hotmail and AOL are going to Spam, though I've implemented every validation method (works for Gmail though)

I've implemented everything and checked everything (SPF, DomainKey, DKIM, reverse lookup), and only Gmail is allowing my emails to go to Inbox. Yahoo, Hotmail and AOL are all sending my messages to ...
8
votes
2answers
1k views

Automated telephone call about sending spam mails

We just got a call from a US telephone number (001-, didn't get the rest of it) with an automated voice, stating that someone had sent spam mails from a server located in Berlin. I didn't take the ...
2
votes
1answer
1k views

Postscreen sometimes stops the mail with 450 4.3.2 Service currently unavailable

I have a problem with postfix sometimes, inconsistently rejecting client mails: Sep 15 09:24:07 mail postfix/postscreen[16209]: NOQUEUE: reject: RCPT from [x.x.x.x]:15037: 450 4.3.2 Service currently ...
0
votes
0answers
20 views

PHPMailer - Track calls to find spam script

Through making logs more verbose, I've managed to find that all the spam calls are being made from class-phpmailer.php in a Wordpress installation. However, this isn't that helpful - this is the ...
0
votes
2answers
34 views

How to identify spamming script

I know this is an age-old question but I've not found a satisfactory answer on how to identify a spamming script on postfix. I know I've to look at the mail logs for postfix, get the message ID and ...
0
votes
0answers
21 views

SpamExperts filtering outbound mail

I've got a hosted domain & mail server. It is attached—somehow—to a SpamExperts installation. I've been training the filter for years and it does a fine job filtering out the incoming garbage. ...
0
votes
0answers
16 views

External email from specific database going to junk folder

I have migrated from Exchange 2010 to Exchange 2013, after which things are okay. I have four server plus two databases as below: Servers: CAS01, CAS02, MBX01, MBX02 Database: DB1 mounted on MBX01 ...
1
vote
0answers
9 views

Prevent misdirected bouncebacks from forwarding server

Note: This question is a duplicate of Avoid creating backscatter on a Postfix forwarding server, for which the only answer was "sorry, nothing you can do", but I provide more detail here, consider ...
0
votes
1answer
27 views

Exim server maillog are flood by spam attemps? [closed]

My log is flooded with those spam attemps and I wonder if there is a ACL can stop those attemps. maillog (this is just a sample, my log will be over a 1000 line in an hour) 2016-07-09 22:00:32 [...
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 ...
1
vote
4answers
589 views

How do SPF records reduce spam?

How do SPF records reduce spam? Note: I'm not asking how to setup an SPF record; I already know how to do this. Does the receiving mail server lookup the SPF record and determine if where the mail is ...
-1
votes
0answers
12 views

how to construct a postfix check for an “improper folded header field made up entirely of whitespace (char 09 hex)”

I have a MUA which seems to be capable of generating mails which get rejected by other servers' amavis with the following message: X-Amavis-Alert: BAD HEADER SECTION, Improper folded header field ...
1
vote
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 (http://...
-1
votes
0answers
45 views

Getting Bombarded By Emails [migrated]

My email is configured as follows: I have a gmail account under my name, which is my primary email account. My gmail is then set to check the email account "webmaster@taxiwayalpha.com", and retrieve ...
1
vote
2answers
74 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 ...
4
votes
3answers
4k views

Delete from mailq where subject matches

I have a mailq which is getting backed up with multiple emails with the same subject line. I would like to delete all emails in the mailq that match a particular subject line so they don't get sent. ...
0
votes
1answer
29 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
vote
1answer
35 views

Can mailman/exim reject nonmember postings at connection time?

I am using Mailman with Exim. When a nonmember posts to a mailing list, Mailman can be configured in any of the following ways, each of which has a problem: Accept it -- this distributes spam to ...
1
vote
3answers
99 views

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

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 ...
-1
votes
0answers
24 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 [...
2
votes
1answer
31 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 ...
0
votes
0answers
12 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
votes
1answer
56 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
votes
2answers
40 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 ...
1
vote
3answers
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 ...
0
votes
0answers
49 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 ...
0
votes
1answer
24 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
votes
1answer
57 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
votes
1answer
32 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 ...
0
votes
0answers
24 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 ...
3
votes
2answers
23k views

Allow email from a particular sender through spam filter

We are running exchange 2010 and are using the built in anti-spam feature. We have set up Content Filtering, IP Block List Providers, Sender ID, Sender Reputation and it filters out most of the junk ...
0
votes
2answers
49 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 ...
3
votes
1answer
152 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: ...
3
votes
2answers
165 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 virus/...
20
votes
4answers
2k views

What are the best methods for catching snowshoe spam?

I'm using Smartermail for my small mailserver. We've been having a problem lately of getting waves of snowshoe spam that follow the same pattern. They come in batches of 3 or 4 at a time. The ...
1
vote
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 ...
0
votes
1answer
27 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 ...
0
votes
2answers
45 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@...
0
votes
1answer
54 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 ...
0
votes
0answers
29 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
votes
1answer
60 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
vote
1answer
48 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 ...
3
votes
1answer
3k 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 ...
33
votes
5answers
605 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 ...
-2
votes
4answers
77 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
votes
1answer
59 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 ...
0
votes
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 ...
-2
votes
1answer
33 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
61 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@...
0
votes
0answers
38 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 ...