All Questions
53
questions
1
vote
1
answer
194
views
After adding a new DNSBL to Sendmail, how can I resubmit an email to see if it will be rejected?
TL;DR
How can I fool my own sendmail into thinking an email comes from a particular ip address, so that it rejects the message due to a DNSBL match?
Details:
I run my own mail server, and most spam is ...
- 73
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
92
views
Linode (Debian) box with multiple web apps - is it possible to send emails from multiple domains via sendmail?
I have a Linode instance in which I'm going to host several small-ish LEMP apps. Each of these apps need to send emails to users (mostly for account registration... forums/comments and whatnot). I'd ...
0
votes
1
answer
465
views
Something sends emails to [email protected] permanently
I'm watching multiple lines in maillog for the last few days
Feb 26 06:00:17 d3355 sm-mta[2682]: x1L5tNWu013205: to=<[email protected]>, delay=4+21:04:54, xdelay=00:00:00, mailer=esmtp, pri=...
- 175
0
votes
2
answers
404
views
Filter mail recipient by alias matching with sender's domain
I use an alias for each company that I provide an e-mail contact. So, for example, in /etc/aliases
somecompany: myuser
The address I supply to SomeCompany would be [email protected]
If the ...
- 101
-4
votes
1
answer
75
views
EL5 /etc/hosts.deny not denying ".top"? [closed]
I get spam e-mails from places such as [email protected]
among a LOT of others.
I have an appropriate entry in /etc/hosts.deny but it doesn't seem to
block anything from the .top domain. ...
- 9
-1
votes
2
answers
2k
views
How does SORBS block my emails?
On a 1&1 shared hosting, I'm using mail(...); from a PHP script (which itself calls /usr/sbin/sendmail -t -i) and finally I get an error message (see below).
More or less my mail (I send less ...
- 769
3
votes
0
answers
2k
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 ...
- 2,192
-2
votes
2
answers
319
views
Mitigating spam on Linux server where all MTA's (Postifix, PHP Mail() function) etc. are disabled [duplicate]
We have a Debian Squeeze server running a fairly standard LAMP stack (back in the days it was set up using the Perfect Server guide at Howtoforge, so we're using ISPConfig as our backend admin panel) ...
- 75
1
vote
1
answer
206
views
How To Only Restrict PHP5/Apache to Send Mail Only To Local Users
I need some help. I am running lastest stable Ubuntu which hosts Apache/PHP5 and also delivers email. I host some WordPress sites for other users and have been waging a war for months now combatting ...
- 339
5
votes
2
answers
33k
views
AOL bounces with: AOL will not accept delivery of this message [closed]
AOL started bouncing emails from my mail server with the following error:
521 5.2.1 : AOL will not accept delivery of this message.
554 5.5.0 Remote protocol error
On the troubleshooting page AOL ...
- 53
2
votes
4
answers
8k
views
Postfix 2.9 or sendmail, outgoing spam prevention (check if sender exists)
Operating System: Linux Ubuntu 12.04 TLS
Context: Plesk 11.5
Utility: Postfix 2.9.6 (updates restricted by Plesk 11.5 distribution)
I would like Postfix to check the 'sender' field of every outgoing ...
- 148
1
vote
1
answer
715
views
Outgoing Spam through hacked Mail Accounts
Already searched some Hours about this Problem - but no good Solution in sight - so maybe someone here can help me on this.
We offer Webhosting / Mail Services. Lately the amount of Hacked E-Mail ...
- 11
0
votes
2
answers
255
views
Tracing down spam
How can I find the source of out going spam on a linux server?
tail -f /var/log/exim_mainlog
2014-10-24 15:02:37 [28750] 1Xhl4A-0007Te-9C Completed QT=7s
2014-10-24 15:02:37 [28746] SMTP ...
- 3,941
-1
votes
1
answer
738
views
Too many sendmail instances in “top” command
I got a server with mysql+php running on it only. Cronned PHP scripts (not available publicly) send occasionally emails, but not more than 10 per hour. However, whenever I type "top" in bash I see ...
- 411
2
votes
2
answers
2k
views
Mail not delivered from custom email server (MS Exchange)
I have my own Exchange Server 2013 (SP1). I am able to receive emails ok but sending emails is not reliable. Emails sent to gmail or seznam.cz (email provider in Czech Republic) is ok.
The problem is ...
- 73
0
votes
1
answer
2k
views
Sendmail's MTA, MDA and SMTP 550 User Unknown forwarded to postmaster
I have two boxes running sendmail and configured as:
MTA accepting connections from the outside world (mta.xyz.com)
MDA accepting connections from internal network and storing them in user mailboxes (...
- 198
-1
votes
1
answer
910
views
Configure sendmail to reject emails without from addresses
My MTA is receiving lots of emails with no from address specified, for example:
Sep 15 17:09:57 mta1 sm-mta[46864]: STARTTLS=server, relay=mx01.aquila-capital.de [83.236.242.254], version=TLSv1/SSLv3,...
- 198
-1
votes
1
answer
419
views
mail server Best practices PTR and SPF
I have 2 domain names in my server :
domain1.com is the main domain that I am using as a nameserver (ns1.domain1.com and ns2.domain1.com)
and
domain2.com (I am using it to host my web application ...
- 9
5
votes
1
answer
6k
views
Abnormal sendmail activity using up the server memory on my Ubuntu 12.04 server
Environment
Rackspace
Ubuntu 12.04
Wordpress
MySql
The issue
I have been experiencing quite serious out-memory-issues in the last couple of days.
While I resolved one possible cause the issue I ...
- 174
0
votes
2
answers
1k
views
Prevent abuse of sendmail for spam
In web servers that host many websites there is always the possibility of a hacked site being abused in order to send spam mails with some kind of php mailer bot.
In my case sendmail is configured ...
- 447
0
votes
3
answers
4k
views
Server being used to send spam mail. How do I investigate?
Problem
I think my server is being used to send spam with sendmail, I'm getting a lot of mail being queued up that I don't recognize and my mail.log and syslog are getting huge.
I've shutdown ...
- 169
13
votes
3
answers
61k
views
Sendmail: Sender address rejected (Domain not found)
I'm running into problems with sending mail on our webserver. Some mails are sent and delivered without any problems (eg Gmail), while others are deferred with "Sender address rejected: Domain not ...
- 315
1
vote
1
answer
1k
views
How can Sendmail reject email to a local user *unless* it comes from a trusted subnet?
I have sendmail set up to accept mail for a few domains and to relay messages for a few subnets' worth of systems. Recently a particular internal-use-only address has been receiving a lot of spam. I'...
- 3,166
-1
votes
1
answer
1k
views
sendmail - Server Sending Spam? [duplicate]
for the past day my server is being used to send a spam.
I'm using the Amazon Linux Distro (RedHat based). It has sendmail 8.14.4.
It is setup to require authentication, SSL etc.
Below are some ...
- 109
5
votes
2
answers
7k
views
How to make sendmail accept connections from localhost only
I need to secure the server by making sendmail-mta accept only local connections (from localhost), so that any external (potential spam) connections are denied.
I use Debian 7.0 currently.
- 349
-1
votes
1
answer
156
views
Sendmail mqueue deferred (list.dsbl.org) [closed]
Hi I have a issue with a mailserver configured with sendmail.
In mailq I have many entrys with:
(dnsbl map: lookup (254.0.168.192.list.dsbl.org.): deferred)
Thanks.
0
votes
1
answer
1k
views
Sendmail Spamming Recipient
I am using a perl script to send daily status to my gmail account.
For some reason, sendmail seems to be spamming gmail although I am only sending one email
Gmail is complaining about a failed ...
- 23
0
votes
4
answers
2k
views
Stopping incoming spam with sendmail [duplicate]
I am having an issue due to a "smart" sysadmin that made some choices while I was away for two months: Spam.
I manage probably close to 10,000 web/mail sites. He decided to allow all mail to ...
- 293
0
votes
2
answers
3k
views
Why are my emails going to spam folder?
My server ip is 78.46.138.249 and none of the blacklists I could find blacklist my domain. Nevertheless, many of my customers recieve their emails in their SPAM folder. I just created a live.com ...
- 145
0
votes
1
answer
10k
views
PHP Web Mail going to spam folder
I was working for my college website, and I wrote a php script that sends email using php mail function. But the problem is, all the emails that I send are going into the recipients spam/junk Folder.
...
0
votes
2
answers
1k
views
Output php mail calls to log file
This question relates to the question found here:
Find the php script thats sending mails
Trying to do the exact same thing but can't get the log to output what I need. Not too experienced with ...
- 193
0
votes
1
answer
196
views
sendmail injection
I have a server running sendmail. It started sending out tons of spam. I went it, shutdown sendmail cleaned out the queue (removed everything in /var/spool/mqueue).
How-ever, as soon as I restart ...
- 1
0
votes
4
answers
4k
views
how to block spammer using my mailserver
how to defend my mailserver using by spammer to send email to etc yahoomail , gmail , etc
my mail server now blocked by gmail.
already setting to block of all that but still attacked by spammers
...
- 31
0
votes
2
answers
347
views
DKIM signed mails go to spam folder and do not show key icon
I have installed DKIM for my sendmail and I have also configured it. But I still see that my emails are being considered as spam by gmail. Also, I do not see the "key" in the emails (even if I unspam ...
- 423
1
vote
1
answer
3k
views
Does the server hostname need to match the domain name of the email address you are sending from? Does the hostname need to be verifiable with DNS?
I am trying to diagnose why email won't send from a new RHEL v5.8 server. Sendmail is up and running, but everything is stuck in the queue (confirmed with mailq) with connection timed out errors.
If ...
- 302
3
votes
2
answers
4k
views
sendmail is using return-path instead of from address
I have a customer that is complaining about emails marked as spam.
I'm looking at the header. It shows the correct From: [email protected]
However, it doesn't like the return-path.
Return-Path: &...
- 169
1
vote
4
answers
175
views
sendmail sending mail to recipients I don’t know of; possible spam host
Recently I did an audit of my machine with logwatch and found out that my machine sends around 582 mails everyday.
STATISTICS
----------
Messages To Recipients: 582
Addressed Recipients: ...
- 4,443
0
votes
1
answer
538
views
Blocking External Mail Sent w/ Spoofed Email Address
We recently got an email from an outside server that had a spoofed "From:" header that was the email address of one of our users. Is there a way to have sendmail reject emails coming in from an ...
- 3,529
4
votes
1
answer
3k
views
Server Sending Spam?
We have some servers hosting websites and email accounts for clients.
Today we found that one of our servers has a very heavy load and by looking at the maillog it is doing a lot of sending to ...
- 543
2
votes
1
answer
58
views
Spam filtering in bridging
I'm using sendmail with spamassasin, one of my server is working behind it. All the port 25 traffic for the server behind it is being filtered.
User are using SMTP authentication enabled in ...
- 781
1
vote
1
answer
76
views
Suspected Spam Issue
Recently I've got problem from sending email out, it's about relaying denied. After doing some checking I found that my ip is being blacklisted, because of spamming. I checked my maillog and I found ...
- 13
1
vote
2
answers
1k
views
spamassassin with sendmail: spamass-milter or spampd?
I want to integrate my sendmail MTA (relaying only, no local mailboxes) with spamassassin. Sendmail box sits between internal MS Exchange server and internet. So, I see two options for doing this (or ...
- 501
0
votes
3
answers
1k
views
sendmail rules for filtering spam
Can anyone help me with constructing sendmail rules for limiting spam?
Assuming that name of my domain is my.domain.com, I want to use following rules:
If BOTH sender and recipient address is from my....
- 501
30
votes
4
answers
12k
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 ...
- 405
4
votes
7
answers
21k
views
all mails going to gmail SPAM (sendmail on centos) 127.0.0.1 problem?
UPDATE ON SPF CHECK http://www.openspf.org/Why:
The SPF check gives me this: An SPF-enabled mail server rejected a message that claimed an envelope sender address of [email protected]. An SPF-...
- 1,141
2
votes
5
answers
2k
views
Google marks seemingly perfect emails as spam
First post - was directed here from stackoverflow!
The problem: Google marks seemingly correctly formatted emails from my apache/postfix server as spam. Sample email as follows;
(I have replaced my ...
- 475
0
votes
1
answer
733
views
Spam building up in sendmail's /var/spool/mqueue folder
the server we maintain has recently been running out of memory - this was found to be due to many sendmail processes. Looking at /var/spool/mqueue there is approx 500 emails/30 seconds being put in ...
Jra
0
votes
3
answers
457
views
Need advice on integrating mail server with a smallish social network?
I have been given a task to setup email management and delivery for a smallish social network. We're currently sending out about 1000 emails per day with help of VerticalResponse (a bulk emailing ...
- 471
2
votes
2
answers
311
views
Spam daily report on servers using sendmail
we'd like to implement a daily spam report to our users like Dreamhost does.
Basically we need to send a daily mail (at midnight for example) to inform a single user of all the emails currently in his ...
Simone Magnaschi