Exhibit 2.1

Execution copy

ADDENDUM TO THE IRREVOCABLE UNDERTAKING

This addendum (the Addendum) is entered into on 14 August 2015 between:

FedEx and PostNL are hereinafter also individually referred to as a Party and collectively as the Parties.

WHEREAS

THE PARTIES NOW HEREBY AGREE AS FOLLOWS

The Parties confirm the continued existence of the Irrevocable as of the date of its signing on 6 April 2015 and hereby agree that Clause 6.1.2 header and subparagraph (b) of the Irrevocable is amended and will read as follows:

“In addition to clause 6.1.1 and subject to clause 6.1.3, this Agreement shall terminate immediately (without prejudice to accrued rights and/or liabilities arising from the prior breach of this Agreement) if:

(…)

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(…) ”

Subject to the amended terms and conditions of the Irrevocable pursuant to Clause 1.1, the Parties confirm and acknowledge that the Parties are and remain bound by the terms and conditions of the Irrevocable and that the Irrevocable is in full force and effect.

TNT Express N.V. will sign this Addendum for acknowledgement and agreement.

This Agreement forms an integral part of the Irrevocable as amended hereby and, where appropriate, any reference to the Irrevocable will also be a reference to this Addendum and vice versa. Articles 8 (Notices), 9 (Miscellaneous) and 10 (Governing law and jurisdiction) of the Irrevocable apply to this Addendum mutatis mutandis.

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Signature page to Addendum to Irrevocable

This Addendum has been signed on the date stated at the beginning.