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How to use MSMTP with Gmail, Yahoo and PHP Mail

Linux 12 Comments

This is a three in one tutorial which combines how to use MSMTP to send mails via Gmail and Yahoo servers and how to use MSMTP with PHP Mail() function instead of the default sendmail.

Installing msmtp

To install msmtp on Red Hat/CentOS/Fedora type of distributions

yum install msmtp

To install msmtp on Debian/Ubuntu type of distributions

apt-get install msmtp

Configuring msmtp with Gmail and Yahoo

Create or edit the msmtp configuration file in the user’s home directory. I use VI editor to achieve this

vi ~/.msmtprc

Add the following lines to the file, it configures msmtp for both Gmail and Yahoo

account yahoo
tls on
tls_starttls off
auth on
host smtp.mail.yahoo.com
user user1
from user1@yahoo.com
password ******
account gmail
tls on
auth on
host smtp.gmail.com
port 587
user user1@gmail.com
from user1@gmail.com
password ******

Since the file contains sensitive data like passwords you should assign secure permissions

chmod 600 ~/.msmtprc

Continue Reading…

How to save IPtables rules in Debian

Linux 5 Comments

This article explains how to make IPtables firewall rules sustain a boot in Debian. But this can also be applied on other Debian based OSes like Ubuntu and Knoppix. You show execute all these commands as the root user or use the sudo command to do it.

First view the list of rules in IPtables

iptables -L

If its a new installation there will be no rules. So add some firewall rules, the following rules will allow HTTP, HTTPS, FTP, SMTP, SSH incoming connections and rejects all other incoming connections including ICMP ping packets.Continue Reading…

How to assign a static IP address in Linux

Linux 2 Comments

This article explains assigning a static IP to your Linux machine through the command line. If you’re assigning a public IP address, you should’ve purchased it from your ISP. Assigning the IP address in Linux requires you to edit the network configuration file. The network interface files are located at different places according the Linux OS variant. This article will cover both Red Hat and Debian variants. You need to logged in as the root user to edit these files, or you should have sudo permissions.Continue Reading…

Linux ACL Tutorial

Linux 2 Comments

Access Control Lists( (ACLs) are a way to assign fine tuned permissions in Linux apart from using the chmod command. When the chmod command is used only one owner and one group can be assigned permissions on a file or directory. If multiple users need access to a resource we need to place them in a group and then give that group the necessary permissions. But with File ACLs in Linux we can assign fine grained permissions to each user and group on a file and even deny access to a particular user even if the file has world permissions. This tutorial on Linux File ACL will explain the usage of the commands getfacl and setfacl.Continue Reading…

How to make undeletable files and directories in Linux

Linux 6 Comments

A very useful Linux tip on how to make files and directories undeletable even by the root user. You can apply this tip on all important configuration files so that no one accidentally or intentionally deletes it. To achieve this the chattr (Change Attribute) command is used it Linux. The chattr command “immunizes” the file not only from deletion but also modification. The chattr command does care about chmod values, even if a file has 777 permissions immunizing the file will prevent it from being deleted or modified.Continue Reading…

Configure BIND DNS Split View

Linux 1 Comment

Configure BIND DNS Views and Split to respond to different DNS clients with different answers based on their IP address. If you have many computers connected via LAN among which one is a web server, within the local network you may want domain names to resolve to private IP addresses and from the internet it should resolve to the public IP address. This can be done with BIND’s split-horizon feature. Based on a list of IP addresses of clients the DNS server replies with the appropriate answer. Take note that if you decide to configure split view all zones should come under a view.Continue Reading…

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