SMTP is a communication protocol for electronic mail transmission.

SMTP Port

• IPv4 Ports: SMTP port for IP version 4.
• IPv4 Secure Ports: Implicit SSL SMTP port for IP version 4.
• IPv4 TLS Ports: Explicit SSL SMTP port for IP version 4.
• IPv6 Ports: SMTP port for IP version 6.
• IPv6 Secure Ports: Implicit SSL SMTP port for IP version 6.
• IPv6 TLS Ports: Explicit SSL SMTP port for IP version 6.

Service Time

Mode: To apply service time for SMTP response.

1. No Service Time: No service time delay is applied. Helps in doing max load testing.
   • value1: Not Applicable.
   • value2: Not Applicable
   • Description: Helps in doing max load testing
2. Exponential Random: Exponential random service time with median of specified seconds is applied. For exponential random distribution, median is roughly around 1/4th of the mean. This takes a random value equivalent to median time.
   • value1: Median Time(> 0)
   • value2: Not Applicable
   • Description: This takes a random value equivalent to median time.
3. Constant: A constant service time of specified seconds. Helps in doing controlled tests
   • value1: Constant Time (> 0)
   • value2: Not Applicable
   • Description:Helps in doing controlled tests. It takes a constant value. As one can calculate the number of page requests expected within certain duration.
4. Uniform Distribution: It is more Realistic. The value is a random value between the minimum and maximum time defined. Min should be less than or equal to Max.
   • value1: Minimum Time (>= 0)
   • value2: Maximum Time(> 0 and >= Min)
   • Description: It is more Realistic. The value is a random value between the minimum and maximum time defined. Min should be less than or equal to Max.

Command:

• GREETING: Used for session initiation.
• HELO: Starts the conversation identifying the sender server and is generally followed by its domain name.
• EHLO: An alternative command to start the conversation, underlying that the server is using the Extended SMTP protocol.
• AUTH: To authenticate the client to the server.
• USERNAME: Authentication User name
• PASSWORD: Authentication Password
• MAIL: To establish the return address.
• RCPT: To establish a recipient of the message.
• DATA: The email content begins to be transferred; it’s generally followed by a 354 reply code given by the server, giving the permission to start the actual transmission.
• VRFY: The server is asked to verify whether a particular email address or username actually exists.
• EXPN: Asks for a confirmation about the identification of a mailing list.
• RSET: Communicates to the server that the ongoing email transmission is going to be terminated, though the SMTP conversation won’t be closed (like in the case of QUIT).
• NOOP: Used only to check whether the server can respond. “250 OK” reply in response.
• QUIT: Terminates the SMTP conversation.
• HELP: A client’s request for some information that can be useful for a successful transfer of the email.
• ALL: To apply service time for all of the commands, choose ALL.

Average Time: The Time taken in between Min and Max time (Formula: (Min+Max)/2) or (no of transactions * time of each transaction / total no of transactions).

Maximum Time: Time taken for completing the Service test.

Authentication

Mode: To support authentication mechanism for SMTP.

• Do Not Enable Auth Login: Do not enable authentication login.
• Enable Auth Login But Do Not Check Validity Of User Name/Password: Enable authentication login but do not check validity of username and password.
• Enable Auth Login And Check Validity Of User Name/Password: Enable authentication login and check the validity of username and password.

Error Simulation

• Command
  • GREETING: Used for session initiation.
  • HELO: Starts the conversation identifying the sender server and is generally followed by its domain name.
  • EHLO: An alternative command to start the conversation, underlying that the server is using the Extended SMTP protocol.
  • AUTH: To authenticate the client to the server.
  • USERNAME: Authentication User name
  • PASSWORD: Authentication Password
  • MAIL: To establish the return address.
  • RCPT: To establish a recipient of the message.
  • DATA: The email content begins to be transferred; it’s generally followed by a 354 reply code given by the server, giving the permission to start the actual transmission.
  • VRFY: The server is asked to verify whether a particular email address or username actually exists.
  • EXPN: Asks for a confirmation about the identification of a mailing list.
  • RSET: Communicates to the server that the ongoing email transmission is going to be terminated, though the SMTP conversation won’t be closed (like in the case of QUIT).
  • NOOP: Used only to check whether the server can respond. “250 OK” reply in response.
  • QUIT: Terminates the SMTP conversation.
  • HELP: A client’s request for some information that can be useful for a successful transfer of the email.
• ALL: To apply service time for all of the commands, choose ALL.
• Percentage: Value in percent for which user wants the user defined response in case of error simulation. 
• Response: User defined response in case of Error simulation.