Best mail server for ubuntu 16.04

There are several excellent mail servers that can be used with Ubuntu 16.04. 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 mail 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 or more complex mail servers.
3. Sendmail: Sendmail is a classic mail server that has been around for a long time. It's still widely used today, and it's included in the Ubuntu repositories. However, it's not as popular as Postfix or Exim, and it can be more difficult to set up and configure.
4. OpenSMTPD: OpenSMTPD is a modern mail server that is designed to be fast, secure, and easy to use. It's not included in the Ubuntu repositories by default, but it can be easily installed from the Ubuntu repositories or from a third-party PPA.
5. Mail-in-a-Box: Mail-in-a-Box is a self-contained mail server that includes a web interface and a variety of features, such as spam filtering and virus scanning. It's not included in the Ubuntu repositories, but it can be easily installed from a third-party PPA.

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

Postfix:

• Pros: Easy to set up and configure, widely used and supported, good for small to medium-sized mail servers.
• Cons: May not be suitable for large or complex mail servers, limited customization options.

Exim:

• Pros: Highly customizable, good for large or complex mail servers, supports a wide range of features and plugins.
• Cons: Can be more difficult to set up and configure, may require more technical expertise.

Sendmail:

• Pros: Classic mail server with a long history, still widely used today, good for small to medium-sized mail servers.
• Cons: May not be as modern or feature-rich as other options, can be more difficult to set up and configure.

OpenSMTPD:

• Pros: Modern mail server with a focus on security and performance, easy to set up and configure, good for small to medium-sized mail servers.
• Cons: Not as widely used or supported as other options, may require more technical expertise.

Mail-in-a-Box:

• Pros: Self-contained mail server with a web interface, includes a variety of features such as spam filtering and virus scanning, easy to set up and configure.
• Cons: Not included in the Ubuntu repositories, may require more technical expertise to customize and configure.

Ultimately, the best mail server for Ubuntu 16.04 will depend on your specific needs and requirements. If you're looking for a simple and easy-to-use mail server, Postfix or OpenSMTPD may be a good choice. If you need a more customizable and feature-rich mail server, Exim or Mail-in-a-Box may be a better option.