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Internet Standards (SPF and DKIM) and Deliverability

For standards like SPF and DKIM / DomainKeys, whether they improve deliverability or bypass filters is entirely at the discretion of the validating receivers. It is expected that messages from a sender with a good reputation would be subject to less scrutiny by the receiver's filters. In other words, omitting these standards usually doesn't hurt, but providing them can only help deliverability.

Some other things to consider:

Additional resources

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