If you would like your outbound SMTP only to be sent from servers in a specific country please use the following servers:
Location | SMTP Server | SPF Include |
United States | outbound.ore.mailhop.org | include: _spf.outbound.ore.mailhop.org |
Germany / EU | outbound.eu.mailhop.org | include: _spf.outbound.eu.mailhop.org |
Do not use the SPF record include:outbound.mailhop.org just use the corresponding record based on the location.