How can I configure the sending time when sending faxes via Mail?

How can I configure the sending time when sending faxes via Mail, i.e. from an ERP or CRM system? 

You can set the sending date if the following information for the sending time is provided in the SMTP headers when sending. For example, if you want to send your fax on 06-29-2018 at 3 PM (central european time):

x-c4bdateutc: 20180629

x-c4btimeutc: 130000

Date in the format YYYYMMTT 

Time in the format HHMMSS