Enum SenderAuthenticationSource

Namespace

MailFathom.Domain.Emails.Authentication

Assembly

MailFathom.Domain.dll

Who reached a message's sender-authentication verdict.

public enum SenderAuthenticationSource

Fields

LocalVerification = 1

MailFathom verified the message's own DKIM signatures, because no trusted server statement was available.

Reached only as a fallback. An account whose receiving server writes the header goes on believing that server, so the two never sit beside each other on one message. Everything such a verdict names came from a signature in the stored bytes and a key the signing domain publishes: nothing about the envelope, the connecting address, or the sender's DMARC policy is knowable here, and the columns holding those record that they were not evaluated.

ReceivingServer = 0

The verdict is what the account's trusted receiving server wrote, read back out of its header.

It is also what a message carries when nothing was read at all — no trusted authority, no header bearing its identifier, and local verification switched off. The value names which reading produced the verdict rather than asserting that a server established something, so a not-established verdict reached this way carries it too.

Remarks

The two are not interchangeable and the difference cannot be inferred from anything else on the row. A receiving server saw the connection the message arrived on, so it could evaluate SPF against the connecting address and read an envelope sender this process never had. MailFathom, verifying after delivery, has the signed bytes and a published key and nothing else — which is enough for a cryptographic identity and for nothing that depends on the transport.

It is recorded because an account's configuration may change afterwards. A reader meeting a verdict months later cannot work out from the trusted authority in force today which of the two produced the row in front of them, and a cryptographic signature check and a verdict taken with network context nobody has any more are worth different amounts.