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Login Email Uniqueness

The Login Email of each traveller (profile), whether active or inactive, must be unique.

The Login Email of each traveller (profile), whether active or inactive, must be unique.

From time to time an agency may encounter a problem when creating a profile if the Login Email (address) provided is associated already with another profile in Kudos' database. This could be a profile for a company associated with your agency or a different one.

  • This usually occurs when a non-business email address (e.g. is used.

As the Login Email must be unique for each profile, whether active or inactive, the agency could consider the following options.

  • If the traveller is no longer employed or travelling for a previous company, they could request the company or former agency to make their profile inactive (see sub-section below).

  • Use an email alias/alternative valid email of the user, or

  • Subaddressing as Gmail and other email providers allow i.e. inclusion of the "+" symbol
    e.g., (Google: email subaddressing), or

  • A unique false email provided will never be matched to an email address whether it exists in Kudos' global database (DB) or not.

    • This option is not advisable as you never know if/when the "false email" may ever match a real one, as well as this information, is synced with integrated systems (e.g. GDS, OBT) which means suppliers and vendors (e.g. airlines, hotels) will be a recipient of fake info. 

      • The agency would therefore be non-compliant with the IATA Resolution 830d (passenger contacts) mandate, and

      • An airline potentially now or in the future could issue an ADM (Agency Debit Memo) if mishandling of the passenger resulted (e.g. missed flight).

What is Email Sub-Addressing?

Email sub-addressing, also known as "plus addressing" or "tagged addressing," is a technique that allows users to create multiple, unique email addresses with a single base email account. This is done by appending a 'tag' or 'modifier' to the local part of the email address, typically using a plus sign (+) followed by the tag, before the '@' symbol.

For example, if your base email address is, you can create sub-addresses like:

These sub-addresses will all route messages to the main email account ( while allowing you to easily filter, sort, or organize emails based on the tags used. It also helps in identifying the source of spam or unwanted emails if a specific sub-address was used only for a particular service or subscription.

Not all email service providers support sub-addressing, and the implementation might differ across providers. For example, Gmail uses the plus sign (+) for sub-addressing, while some other providers might use a different character, like a hyphen (-) or an equals sign (=). It is essential to consult your email service provider's documentation to understand if and how they support email sub-addressing.

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