What is ARC? A Plain-English Guide
ARC (Authenticated Received Chain) preserves authentication results when mail is forwarded, so legitimate forwarded email is not broken by SPF/DKIM failures at the final hop.
Why it matters for deliverability
Understanding ARC is part of keeping forwarded mail authenticated. Get it right and more of your mail reaches the inbox; get it wrong and even legitimate mail can be filtered.
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How Rainmail helps
Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, plus an AI that watches your list health and deliverability — and it welcomes the senders Amazon SES, SendGrid and Mailchimp reject, from $8. Run the free 10-second checker or see plans.