mxresolv

func Lookup ¶

func Lookup(ctx context.Context, hostname string) (retMxHosts []string, retImplicit bool, reterr error)

Lookup performs a DNS lookup of MX records for the specified hostname. It returns a prioritised list of MX hostnames, where hostnames with the same priority are shuffled. If the second returned value is true, then the host does not have explicit MX records, and its A record is returned instead.

It uses an LRU cache with a timeout to reduce the number of network requests.

func ResetCache ¶ added in v4.14.2

func ResetCache()

ResetCache clears the cache for use in tests, and is not Thread-Safe

func SetDeterministicInTests ¶ added in v4.17.1

func SetDeterministicInTests() func()

SetDeterministicInTests sets rand to deterministic seed for testing, and is not Thread-Safe.