Downgrading
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Downgrade - (this is not referred to dictionary meaning but name of EAI technology)
Internationalization (UTF8SMTP) extension allows UTF-8 characters in SMTP envelope and mail header fields. To avoid rejecting internationalized Email messages when a server in the delivery path does not support the UTF8SMTP extension, some sort of converting mechanism is required. This is known as Downgrading mechanism for Email Address Internationalization[1]. The entire protocol is now part of RFC 6530,31.
Note that this is a way to downgrade, not tunnel. There is no associated up-conversion mechanism, although internationalized email clients might use original internationalized addresses or other data when displaying or replying to downgraded [2]messages.
Downgrade Example:
If an email Email From UTF8 Compliant Email Server is sent having FROM email ID as যোগাযোগ@ডাটামেল্.ভারত (Bengali Script) and Recipient Email Server if not UTF8 compliant than sender SMTP should automatically follow downgrading and change from যোগাযোগ@ডাটামেল্.ভারত to Punnycode. The punnycode of this ID will look like xn--r5ba4eb8etdd@xn--z5bd4bq1db8d6b.xn--45brj9c .
Advance Downgrading:
There is also research going on to automatically covert EAI to a standard ASCII[3] email address, instead of downgrading to punnycode.
- ^ "Email address". Wikipedia. 2017-09-06.
- ^ "Downgrading Mechanism for Email Address Internationalization - RFC5504- NetFeeds". netfeeds.eu. Retrieved 2017-09-10.
- ^ XgenPlus (2017-09-06), XgenPlus : Not just Downgrading, Introducing Advanced Downgrading, retrieved 2017-09-10