-2
votes
0answers
17 views

Local SMTP Server — prevent spam flag? [migrated]

I opened up port 25 on my router, so now I can use sendmail to send email. However, the emails I send are being marked as spam by my personal gmail account (understandably). The "from" field defaults ...
-1
votes
3answers
106 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 ...
1
vote
3answers
507 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 ...
0
votes
1answer
61 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. ...
-1
votes
1answer
263 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 ...
2
votes
2answers
280 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.
0
votes
0answers
155 views

Server is being used to send spam email via sendmail

When I run sudo tail -f /var/log/mail.log I can see a number of 'live' entries appearing such as Jun 6 00:40:03 ks393391 sm-msp-queue[2641]: r55MV0l1001642: to=ledbpw@gmail.com, ctladdr=www-data ...
0
votes
1answer
767 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 ...
0
votes
4answers
347 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 ...
0
votes
2answers
525 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 ...
0
votes
1answer
432 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
1answer
227 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 ...
0
votes
1answer
83 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
votes
4answers
2k 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 ...
0
votes
2answers
213 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 ...
1
vote
1answer
342 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 ...
2
votes
2answers
468 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: reg@company.com However, it doesn't like the return-path. Return-Path: ...
1
vote
4answers
107 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: ...
0
votes
1answer
181 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 ...
4
votes
1answer
2k 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 ...
2
votes
1answer
47 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 ...
1
vote
1answer
47 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 ...
0
votes
2answers
383 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 ...
0
votes
3answers
305 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 ...
3
votes
1answer
896 views

Prevent mail being marked as spam

This is a canonical question about avoiding outgoing mail being classified as spam. I'm wondering how to prevent my emails from my site being marked as spam? I'm using sendmail. I'm trying to ...
2
votes
7answers
6k 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 support@ourdomain.com. An ...
2
votes
6answers
1k 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 ...
0
votes
1answer
411 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 ...
0
votes
3answers
387 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 ...
2
votes
2answers
238 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 ...
1
vote
3answers
532 views

Linux sendmail spam?

I have a linux server with sendmail doing spam filtering for some years. We usually do filtering spam by using spamcop, spamhaus, njabl but we dont seem to keep up. The number of spam mail getting ...
3
votes
2answers
2k views

How do I throttle outbound email with sendmail

I know, I know, I should switch to Postfix. But in the meantime, how do I throttle outbound email (especially email to a single domain) in Sendmail?
2
votes
3answers
767 views

How do you configure sendmail to reject Email with a Date header too far from real time?

A friend of mine using (I believe) qmail has it configured to reject, as SPAM, any incoming Email with a Date: header that is too far from real time. I can't figure out how to do this with sendmail. ...