SPF and DKIM checks

vendor/blitiri.com.ar/go/spf/README.md

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+
+# blitiri.com.ar/go/spf
+
+[![GoDoc](https://godoc.org/blitiri.com.ar/go/spf?status.svg)](https://pkg.go.dev/blitiri.com.ar/go/spf)
+[![Build Status](https://gitlab.com/albertito/spf/badges/master/pipeline.svg)](https://gitlab.com/albertito/spf/-/pipelines)
+[![Go Report Card](https://goreportcard.com/badge/github.com/albertito/spf)](https://goreportcard.com/report/github.com/albertito/spf)
+[![Coverage Status](https://coveralls.io/repos/github/albertito/spf/badge.svg?branch=next)](https://coveralls.io/github/albertito/spf)
+
+[spf](https://godoc.org/blitiri.com.ar/go/spf) is an open source
+implementation of the [Sender Policy Framework
+(SPF)](https://en.wikipedia.org/wiki/Sender_Policy_Framework) in Go.
+
+It is used by the [chasquid](https://blitiri.com.ar/p/chasquid/) and
+[maddy](https://maddy.email) SMTP servers.
+
+
+## Example
+
+```go
+// Check if `sender` is authorized to send from the given `ip`. The `domain`
+// is used if the sender doesn't have one.
+result, err := spf.CheckHostWithSender(ip, domain, sender)
+if result == spf.Fail {
+	// Not authorized to send.
+}
+```
+
+See the [package documentation](https://pkg.go.dev/blitiri.com.ar/go/spf) for
+more details.
+
+
+## Status
+
+All SPF mechanisms, modifiers, and macros are supported.
+
+The API should be considered stable. Major version changes will be announced
+to the mailing list (details below).
+
+
+## Contact
+
+If you have any questions, comments or patches please send them to the mailing
+list, `chasquid@googlegroups.com`.
+
+To subscribe, send an email to `chasquid+subscribe@googlegroups.com`.
+
+You can also browse the
+[archives](https://groups.google.com/forum/#!forum/chasquid).
+