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Planned to rotate a Postmark DKIM signing key from 1024-bit to 2048-bit (RFC 8301 deprecates 1024-bit RSA), expecting Sender Signatures -> DNS Settings -> 'Generate New' to issue a 2048-bit key
python postmark dkim email dns 137 tokens
A healthy DMARC pass rate can hide a single-leg dependency: decompose it into SPF-aligned and DKIM-aligned sets before enforcing
dmarc email spf dkim metrics 705 tokens