Have you heard of custom email addressing? Subaddressing?

Microsoft will introduce support for custom email addressing (a.k.a subaddressing) to Microsoft 365 email services. According to the company’s roadmap, the feature is expected to be fully released in Q3 2020.

For those of you unfamiliar with custom email addressing, this is a feature which can be provided by some email clients enabling users to extend their email address through the ‘+’ symbol or ‘tags’. According to the RFC 5233 internet standard, this is also known as subaddressing

For example, if your email address is username@domain.com you can use the + addressing feature to extend your email address to username+tag@domain.com. If your email address supports subaddressing, every email sent to the latter email address will arrive in your main inbox – i.e. username@domain.com.

The tags can be unique (+netflix, +amazon, +ebay, etc.) which will allow users to generate an infinite number of custom email addresses which can consequently be used for newsletter sign-ups, contact forms, other online forms, etc. 

However, despite all the benefits in helping a user track how their email got shared online, subaddressing is not widely supported across email providers. For example, Google has supported subaddressing pretty much since its beginning. Yet, Yahoo, AOL and most of the other email clients do not.

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