1

Spam issues while using Postfix as a two-way relay

view story
linux-howto

http://serverfault.com – I want to use a Postfix box to do two things: Relay mail from any host on the internet addressed to one of my domains to my Zimbra server Relay mail from my Zimbra server to any address on the internet. To try and accomplish this I have configured Postfix thusly: mynetworks = 127.0.0.0/8, zimbra_ip/32 myorigin = zimbra_server mydestination = localhost, zimbra_server relay_domains = example.com example.org transport_maps = hash:/etc/postfix/transport_map local_transport = error:no mailboxes on this host transport_map looks like this: example.com smtp:[zimbra_server] example.org smtp:[zi (HowTos)

dayu's picture
Submitted by dayu on 12/18/2012

Stories similar to Spam issues while using Postfix as a two-way relay

I'm trying to configure a basic postfix server to allow receipt of email from anywhere to local addresses but not be an open relay.

Current config, seemingly relevant rules:

mydestination = $myhostname, localhost.$mydomain, localhost mynetworks = 0.0.0.0/0 relay_domains = $mydestination

If I change mynetworks back to 127.0.0.1/8 it doesn't receive external mail. Leaving relay_domains blank see

I installed postfix on a bare bones Ubuntu Server 12.04 by typing the following in the terminal.

sudo apt-get install postfix

When asked to choose a mail server configuration type, I chose Satellite system. For the System mail name, I entered ww1.example.com and for the SMTP relay host, I selected mail.example.com. Note that I replaced example.com with my own domain.

postfix relay access denied 19 weeks 2 days ago

I am getting relay access denied when I try sending e-mail via out look on my pc using postfix on my vps.

I have a machine I don't want postfix running on and am using sendmail. I modified /etc/mail/sendmail.mc to have this line(hoping it would send mail through that postfix server)...

define(`SMART_HOST', `postfixhost.yyyy.com')dnl

and ran make to regen the sendmail.cf file and checked it and it looks good.

Postfix relay denied. 3 years 18 weeks ago

I am running Postfix 2.6.1 on Suse 11.2, and am receiving an error message on my windows machine saying "Recipient address rejected: Relay access denied." If I login to my email on the local machine or via squirrelmail I have no problem sending mail. The output of postconf -n is as follows:

server:~ # postconf -n alias_maps = hash:/etc/aliases

I have a Plesk 9.5 mail server (cm.snowbarre.co.za) on Ubuntu 8.04 LTS which forwards all SMTP traffic to an anti-spam server cacti.snowbarre.co.za. Many times I see the headers on the anti-spam server to contain from addresses not hosted on the mail server and I have checked and confirmed that my server is not an open relay server. How can a spammer be using my server to relay spam traffic?

Postfix Relay to Office365 1 year 9 weeks ago

I am trying to setup a Postfix server on a Linux box to relay all mail to our Office365 (Exchange, hosted by Microsoft) mail server, but, I keep getting an error regarding the sending address:

BB338140DC1: to= relay=pod51010.outlook.com[157.56.234.118]:587, delay=7.6, delays=0.01/0/2.5/5.1, dsn=5.7.1, status=bounced (host pod51010.outlook.com[157.56.234.118] said: 550 5.7.1 Client does not have p

[ubuntu] Multiple SMTP Relay 19 weeks 1 day ago

Dear friends, I have a VPS with multiple domains hosted. Over time I was a problem with shipping to accounts 'hotmail.com'. The solution I found was to hire an SMTP service to relay e. I had to configure Postfix to have some authentication data for each domain.

Since I can't find a solution that works with my config, I lean on you guys to help me out with this.

I've installed postfix and dovecot on a CentOS server. Everything's running well.