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SMTP Field Manual
A collection of SMTP error codes from major inbox providers.
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What is SMTP Field Manual?
To bring more clarity and accuracy to SMTP responses, Postmark presents the SMTP Field Manual, a one-stop resource for understanding SMTP error codes from all the major inbox providers and spam filter services.
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Recent SMTP Field Manual Launches
SMTP Field Manual
A collection of SMTP error codes from major inbox providers.
Launched on November 5th, 2019
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