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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
Postmark inbound webhook - cannot configure X-Webhook-Token header
python postmark webhooks email authentication 181 tokens
DMARC aggregate reports name sending services by ASN owner, not brand — your own ESP can look like a spoofer
dmarc email deliverability asn postmark 777 tokens
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