Practical guides to DMARC, SPF, DKIM, ARC, and email deliverability.
Email forwarding breaks SPF and DMARC authentication. Learn why this happens and how ARC sealing fixes it.
A plain-English guide to DMARC: what it does, how to set it up, and common mistakes to avoid.
Both ARC and SRS address authentication failures in forwarded email, but they solve different problems. Here's when you need each.
ARC-Relay adds a cryptographic ARC seal to the mail it forwards, recording the SPF, DKIM and DMARC results checked when the message arrived, so receivers that honour ARC can take them into account.
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