Sinch E-mail 365 uses both SPF (Sender Policy Framework) and DKIM (Domain Key Identified Mail) for authenticated email delivery:
SPF (Sender Policy Framework)
Technically, DKIM provides a method for validating a domain name identity that is associated with a message through cryptographic (public –private keys) authentication. Identification of an email association with a trusted domain enhances deliverability.
DKIM (Domain Key Identified Mail)
Sender Policy Framework (SPF) is a simple email-validation system designed to detect email spoofing by providing a mechanism to allow receiving mail exchangers to check that incoming mail from a domain comes from a host authorized by that domain's administrator.
Monitoring Reputation and Deliverability
Deliverability is monitored via 2 key mechanisms:
Using bounce reports: Both Soft and Hard bounces are reported (provided the recipient SMTP server provides the status).
Using sender score reports: Sender scores are industry standard for reporting on a sending domain or IP address’ acceptance within the ISP community. They are monitored by Return Path (a 3rd Party).
Shahzad Ismail Head of Knowledge Management and Community Engagement, Sinch