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For a long time, much better than polling your legacy accounts using POP fetch was to automatically forward messages from your legacy accounts to FastMail. If you want near immediate delivery, that is still how it must be done. Unfortunately, there is now a drawback. Without going into a lot of technical detail, messages received at FastMail that have been forwarded may fail DMARC (Domain-based Message Authentication, Reporting and Conformance). This can make false positives on spam checks more likely.
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