![]() Inform the postfix server know who the sender is: The postfix mail server should respond as below :ģ. The function is considered same with postman or transport : See also How to Install Webmin-1.530 in Centos 5.5 using RPM VersionĢ. Postfix is listening and we can communicate with SMTP now. Establish a TCP connection to port 25 which is postfix port ~]# telnet localhost 25 Steps to Perform Testing the Postfix Mail Serviceġ. Perform Testing for Posfix Mail Service using Telnet on Windows Command Prompt : Perform Testing for Posfix Mail Service using Telnet on linux shell ~]# telnet localhost 25 Telnet will verify and check the server responses to mail requests that was typed. ![]() It does the same thing as advanced mail client such as Microsoft Outlook and Mozilla Thunderbird. Instead of using GUI mail client or webmail to test the sending and receiving email,you also can use telnet. In order to test the mail services working properly, testing needs to be performed.
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