GODT-1779: Remove go-imap

internal/dialer/dialer_test.go

@@ -0,0 +1,16 @@
+package dialer
+
+import (
+	"testing"
+
+	"golang.org/x/net/http/httpproxy"
+)
+
+// skipIfProxyIsSet skips the tests if HTTPS proxy is set.
+// Should be used for tests depending on proper certificate checks which
+// is not possible under our CI setup.
+func skipIfProxyIsSet(t *testing.T) {
+	if httpproxy.FromEnvironment().HTTPSProxy != "" {
+		t.SkipNow()
+	}
+}