Backup-Contacts funktioniert nicht

Backup-Contacts doesn't require any tool or computer to back-up. 1-Select the back-up file formate(Excel/VCard) from the setting button. 2-Press export Contacts button to export all the phone contacts. 3-Click email button on the alert.  And enter your recipient email. 4-The backup Contacts file will be sent to your email account in a second.  You contacts backup file is directly sent to you email account without any delay.  Backup your iPhone Contacts for free just by send an email to your own private account.  You can backup all your contacts with a single touch and send them to yourself as a . vcf attachment via email.  All contacts can then easily be restored any time by simply opening the . vcf file in your mailbox with iOS Mail app.  All contacts can then easily be restored any time by simply opening the . vcf file in your mailbox with iOS Mail app.  "No signing in, no accounts, no activations, just send your contacts in a universal format to yourself or others through the mail app.  My Contacts Backup is the easiest way to backup and restore your contacts all from your phone without needing a computer or synchronization.  IMPORTANT NOTE: After sending backup file (*. vcf) to yourself, please check your inbox to see if message arrived and contains attachment (backup file).  This app backs your contacts up, or simply transfers them in a simple, tangible way that just about every device can read. Bravo!  You don't need to be worried about your contacts privacy because we don't save your contact any where online.  Sometimes email providers block attachments if attachment size is too large.  No signing in, no accounts and no activation is required.  Try with another mail account if possible, to send your backup file.