What is the default port used by Postfix?

What is the default port used by Postfix?

• 25
• 45
• 37
• 20 

 

EXPLANATION

Postfix is an open source mail transfer agent (MTA) that is used to route and deliver emails. Postfix is the alternate of widely
used Sendmail MTA. Postfix uses port number 25 (SMTP) by default.