Email clients that support an automated label email format (for example: [e-mail] )

Question

I need to know which email clients support the auto-label email address format.

From the study, I found only one thing: Gmail. They support tagged email addresses, such as:

• [e-mail]
• [e-mail]
• and etc.

The above emails are unique, but [e-mail] refers to unique tags.

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Please note that "auto-tagging" is not GMail-specific; Gmail simply popularized it. Other mail servers support this feature, some use it +as a separator, others use it -.