Imports github.com/badoux/checkmail github.com/gomodule/oauth1/oauth github.com/gorilla/mux github.com/lib/pq github.com/mailgun/mailgun-go/v4 Standard library imports bytes context crypto/sha512 crypto/subtle database/sql encoding/base64 encoding/hex encoding/json encoding/xml fmt html/template log net/http net/url strconv strings time