Best mail server for ubuntu 20.04

There are several excellent mail servers that can be used with Ubuntu 20.04. Here are a few popular options:

1. Postfix: Postfix is a popular and widely-used mail server that is included in the Ubuntu repositories. It's easy to set up and configure, and it's a good choice for small to medium-sized email servers.
2. Exim: Exim is another popular mail server that is also included in the Ubuntu repositories. It's known for its flexibility and customization options, making it a good choice for larger email servers or those with complex email routing requirements.
3. OpenSMTPD: OpenSMTPD is a modern, open-source mail server that is designed to be fast, secure, and easy to use. It's a good choice for those who want a simple, easy-to-configure mail server.
4. Mail-in-a-Box: Mail-in-a-Box is a self-contained mail server that includes a web interface for managing email accounts and settings. It's a good choice for those who want a simple, easy-to-use mail server with a web interface.
5. iRedMail: iRedMail is a popular, open-source mail server that is designed to be easy to set up and use. It includes a web interface for managing email accounts and settings, and it supports a wide range of email clients and protocols.

Here are some pros and cons of each option to consider:

Postfix:

Pros:

• Easy to set up and configure
• Included in the Ubuntu repositories
• Supports a wide range of email clients and protocols

Cons:

• Limited customization options
• Not as scalable as some other options

Exim:

Pros:

• Highly customizable
• Supports complex email routing requirements
• Included in the Ubuntu repositories

Cons:

• Steeper learning curve
• More complex to set up and configure

OpenSMTPD:

Pros:

• Fast and secure
• Easy to set up and configure
• Supports a wide range of email clients and protocols

Cons:

• Limited customization options
• Not as widely used as some other options

Mail-in-a-Box:

Pros:

• Easy to set up and use
• Includes a web interface for managing email accounts and settings
• Supports a wide range of email clients and protocols

Cons:

• Limited customization options
• Not as scalable as some other options

iRedMail:

Pros:

• Easy to set up and use
• Includes a web interface for managing email accounts and settings
• Supports a wide range of email clients and protocols

Cons:

• Limited customization options
• Not as scalable as some other options

Ultimately, the best mail server for Ubuntu 20.04 will depend on your specific needs and requirements. If you're looking for a simple, easy-to-use mail server with a web interface, Mail-in-a-Box or iRedMail may be a good choice. If you're looking for a highly customizable mail server with complex email routing requirements, Exim may be a better option.