Linked Questions

4
votes
1answer
224 views

Does postfix reject spoofed senders?

Is there a reliable way to reject incoming mails with a spoofed e-mail address? What kind of checks does postfix run normally on incoming mails? does postfix check the reverse dns by default? does ...
-1
votes
1answer
441 views

Hotmail blocks company emails, when hyperlink is inserted in the message body [closed]

I received the following results: ========================================================== Summary of Results ========================================================== SPF check: pass ...
0
votes
2answers
2k views

Receiving spam where sender is @mydomain [duplicate]

Possible Duplicate: How to stop people from using my domain to send spam? I am running a mail server with Ubuntu + Postfix + Maia Mailguard + Dovecot, all has been working well until ...
-1
votes
2answers
961 views

Postfix is Sending Spam [duplicate]

I have an Ubuntu 12.04 server, hosted on AWS, that powers a dozen WordPress installations using Nginx and php5-fpm. The problem just began one day. My server was down. Panic! Whenever I turned it on ...
1
vote
2answers
636 views

Postfix - unable to access externally

So I can't seem to access smtp from externally. When using a desktop email client (eM client and thunderbird both fail) I can't get it to hit the server at all. (eM client is trying to hit: ...
1
vote
2answers
160 views

DNS and SPF configuration for Microsoft Exchange

We've started receiving spam with spoofed addresses from our own domain. So I'm trying to get my PTR and SPF records etc correct to prevent it. We're running Exchange 2010 on site with one server ...
-1
votes
1answer
964 views

Configuring postfix to fight spam, 2012 edition [closed]

EDIT: This question was poorly asked, later I found another question which answers what i wanted to know: Spam prevention tips for Postfix I'm running a small (20 users, 30 mailman-lists) server with ...
-7
votes
2answers
723 views

Mail server not sending or receiving after removal from barracuda blacklist to white list [duplicate]

Possible Duplicate: mail loops back to myself | postfix Mail server not sending or receiving after removal from barracuda blacklist to white list. I've checked against black lists and the ...
0
votes
1answer
221 views

Postfix forwards to Gmail being rate limited even with unmodified headers

I've installed Postfix on Ubuntu 14.04 with the defaults. I then configured some virtual aliases to forward email from a few addresses to various personal (mostly Gmail) accounts. This is just to make ...
0
votes
2answers
245 views

Many invalid HELO from

I've been recieving many invalid helo requests from a Microsoft domain. I already did send a question about this but they still do not respond. maillog: Jan 14 19:27:14 relay postfix/smtpd[57104]: ...
0
votes
1answer
254 views

IIS6 SMTP server retrying too fast (after 451 greylist)

I have my IIS6 SMTP server with default retry settings of 15 min, 30 min, etc. but under some circumstances it keeps retrying every minute (or less). How can I fix this? I have seen it retry ...
0
votes
1answer
136 views

Project Honeypot says my mail server has become a spammer [duplicate]

I need help diagnosing this: http://www.projecthoneypot.org/ip_66.18.204.186 It says my server has been sending spam for 4 months! I try to be a responsible mail server admin, I hate spam, I do ...
0
votes
1answer
185 views

smtp(s) proxy to monitor outgoing spam

I am looking for a smtp proxy to install on our gateway which should monitor outgoing smtp traffic to identify the source of recently occuring spam attacks from our network. It would be enough if ...
-3
votes
1answer
97 views

Inspecting the E-mail traffic of a Windows Server 2008 R2 [closed]

I have seen that the IP address of my mail server has added to blocked IP address list on http://psbl.org. I am using this server for personal use. So, it is not that much of an issue that I am, as a ...
1
vote
2answers
86 views

How to block IP addresses from port 25 [closed]

PROBLEM: Users are getting 15-20 SPAM emails per hour, even with SpamAssassin set to its most aggressive settings SOLUTION: SPAM filtering services are available from companies like McAfee (Intel). ...

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