This check is necessary because of the requirements of the browser vendors (Microsoft, Mozilla). This ensures that only you can get your email address as the owner of a signature card that contains this email address.
By sending an email, the verification of the address which should be included in the certificate occurs. This e-mail contains an eight-digit security code which you have to write manually on your PKS order. If we receive your order without the security code, we produce a signature card without an email address.
A later submit of your address on a signature card is not possible. If you subsequently need to register your email address, you have to order a chargeable replacement card according to our price list.

For the use of EGVP two different certificates are needed. First, a qualified signature certificate for signing messages is needed. This requirement meets the requirements of the procedural regulations (especially writing requisite). Moreover, the use of a further certificate for the end-to-end encryption is required.
This certificate is need tol open your mailbox and to encrypt and decrypt the messages (unnoticed for you). There are special requirements since version 2.6.0 of EGVP in this certificate. It has to be a so-called combination certificate (a certificate for signing, encryption and decryption at all). A certificate that meets these requirements is not included in your PKS signature card. The requirements are fulfilled by software certificates.
EGVP offers the convenient way to create software certificates and include them in the application. For EGVP this is the recommended way for using your mailbox. Details are described in the documentation of EGVP at 6.1.1.2.1.