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Inbox placement by mailbox provider: Gmail, Outlook, Yahoo and spam filters

X-Microsoft-Antispam BCL and PCL Values Explained 2026

Decode X-Microsoft-Antispam BCL and PCL values to improve inbox placement. Learn how spam indicators impact deliverability and how MailTester verifies.

Deliverability monitoring, metrics and reporting

X-Forefront-Antispam-Report CIP CTRY IPV SFV Fields Decoded

Decode X-Forefront-Antispam-Report fields like CIP, CTRY, IPV, and SFV. Understand what they mean and how to use them to improve deliverability and email.