Is there any downside to adding DKIM to some but not all emails from a domain?
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In a typical situation where multiple email servers are responsible for delivering email from users of a given domain (e.g. Google Apps, individual SMTP servers, hosted SMTP servers, ...) is there any downside to enabling DKIM for just one of those servers? Will it affect message deliverability for any of the other servers or do unsigned messages transit as normal through external servers?
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Answer:
No significant sized domain can turn on DKIM all at once, so if turning on DKIM for part of a domain adversely affected the delivery of the rest of the messages from the domain, it wouldn't be turned on. Unless the domain publishes an Author Domain Signing Practices (ADSP, RFC 5617) record indicating this, recipients should not expect a domain's signing practices to be uniform.
Jim Fenton at Quora Visit the source
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