From Wikipedia
Hello friends! Today we are discussing “configuration of SMTP mail server” for sending mail in your LAN network.
SMTP stands for simple mail transfer protocol communication between mail servers uses TCP port 25 Mail clients on the other hand; often submit the outgoing emails to a mail server on port 587. For retrieving messages, client applications usually use either IMAP or POP3.
POP3 stands for Post Office Protocol (POP) is an application-layer Internet standard protocol used by local e-mail clients to retrieve e-mail from a remote server over a TCP/IP connection. It uses port 110 for receiving mail
IMAP stands for Internet Message Access Protocol (IMAP) is also an Internet standard protocol used by e-mail clients to retrieve e-mail messages from a mail server over a TCP/IP connection. It uses port 143 for receiving mail
Let’s start!!
Configure static IP in your network for SMTP server as shown below.
Download hmailserver and install it in your system (windows). This installation program will create a hmailServer user with administration rights. Here you need to give the password for admin so that you will be able to manage its installation.
Click on connect which will connect hmailserver to localhost.
Enter admin password to login into hmailserver and click on OK to continue.
You can take help of nmap to ensure whether SMTP with other Services such as IMAP and POP3 has been running successfully on the remote system (192.168.1.104).
From given image to you can observe that all three services SMTP POP3 IMAP are running on port 25 110 and 143 respectively.
Also, new port 587 will get open for submission (SMTP outgoing mail).
After login into hmailserver, it will ask to add domain name, therefore, click on ADD domain.
Enter the domain name of your choice such as pentestlab.local and click the checkbox for Enable.
Now at last click on save which will create a domain “pentestlab.local” into hailmail server.
From the given image you can observe pentestlab.local had been created on the left panel. After then click on Account in order to create a new user for your mail server.
Click on ADD
Now follow the given below step to create a user for your own mail server.
Address: username (info)
Password: Give password for the username
Click the checkbox for Enable
Click on save
Repeat the step to create more users for the mail server.
From the given image you can see I had created three users and for mail server at least you should create two accounts, one account for the sender and other for the receiver.
Select all three protocols SMTP, POP3, IMAP as shown in the image.
Click on SMTP given in left panel select Advance option and type your IP “192.168.1.104” to bind your local IP with the mail server.
After than select Advance option in left panel and type you’re your domain name (for example pentestlab.local) as default domain and click on save.
Select Auto-ban under Advance has given in left panel. Uncheck Enable for auto-ban.
Now open host file from given path system32 > drivers > etc > hosts
Edit your IP (192.168.0.104) with domain name (pentestlab.local) as shown in given image.
Now use two different systems in your local network for sending mail through them.
System 1st
Open Microsoft Outlook and select option Add account.
Click the radio button for “Manual setup or additional server type”
Click on Next.
Click the radio button to choose service for IMAP or pop Click on Next.
Enter the information of mail server for setting your account as given below:
User information
- Your name: info
- Your email: info@pentestlab.local (provide an email id which you have created in hmail server account.)
Server information
- Account type: POP3
- Incoming mail server: 192.168.0.104
- Outgoing mail server: 192.168.0.104
Logon information
- Username: info@pentestlab.local
- Password: ******
Click on more setting and choose option outgoing server and enable the following services:
- Use the same setting (SMTP) requires authentication
- Use the same setting as my incoming mail server
Click on OK
In order to verify server setting for account click on “Test on Account Setting”
From the given image you can observe it is showing green ticks for both tasks with status “completed”. It will show status “fail” if it found any error in the account setting.
System 2nd
Open Microsoft Outlook and select option Add account and repeat above step for mail server account setting.
Note: now you’re having two different accounts on two different systems in the same local network as sender and receiver.
Now we are testing our mail server by sending mail from one system to another with a different account.
Sender: info@pentestlab.local
Receiver: raj@pentestlab.local
Here we are Sending a message from system 1st to 2nd through Microsoft outlook. You can use another method also for account setting and sending mail for example Thunderbird.
Open raj account of 2nd system and verify whether user received any mail from send info or not. Form given image can see we have successfully received mail in raj account.
In this way, you can configure your own mail server for the local network.
