If the device should send an e-mail when the volume of data is exceeded, specify the valid e-mail address here.
- SNMP ID:
 - 2.3.20
 - Console path:
 - Setup > Charges
 - Possible values:
 max. 255 characters from [A-Z][a-z][0-9]#@{|}~!$%&'()*+-,/:;<=>?[\]^_. `
- Default:
 - empty