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I have this email ID for priority visa application:

Tier4priorityservice@homeoffice.gsi.gov.uk

Is this case sensitive?

  • Don't need to worry about it. The chances for them to reply are pretty low. – The Last Word Feb 26 '18 at 18:45
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No.
The global internet email system is not case sensitive, so at the first server the email pass by, any case is ignored (if not removed).

  • Right advice: proceed as if case does not matter. However, "the local-part MUST be interpreted and assigned semantics only by the host specified in the domain part of the address" in other words it can be case sensitive, but very rarely is. See this answer on stackoverflow stackoverflow.com/questions/9807909/… – user16259 Dec 27 '17 at 14:13
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    Actually, technically, the username part of email addresses is case-sensitive, and the domain part is case-insensitive. While many email servers treat usernames on a case-insensitive basis, it is not guaranted. stackoverflow.com/questions/9807909/… – dda Dec 28 '17 at 15:51

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