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Custom email addresses are an optional feature that some email providers can support. The feature is described in the RFC 5233 internet standard.
Officially known as subaddressing, this standard allows users to extend their email address using "tags" or the plus (+) character, hence its two alternative names of tagged addressing or plus addressing.
For example, a user with the email address of email@example.com can use the plus addressing feature to extend their email address to firstname.lastname@example.org.
If the user's email address supports subaddressing, all emails sent to the email@example.com email will land in the user's firstname.lastname@example.org inbox.
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