smtp: fix parsing local-part to allow special characters

Previously, passing "#abcd" to parseLocalDomain will return nil, because
the loop end without any check if special character is found or not.

This commit fix it by setting local variable "found" to true, when
we found the special characters and continue after it..

1 files changed, 9 insertions, 1 deletions

diff --git a/lib/smtp/smtp.go b/lib/smtp/smtp.go
index 46970796..9705be89 100644
--- a/lib/smtp/smtp.go
+++ b/lib/smtp/smtp.go
@@ -185,7 +185,10 @@ func parseLocalDomain(data []byte, allow []byte) (out []byte) {
 	if data[0] == '.' || data[len(data)-1] == '.' {
 		return nil
 	}
-	isDot := false
+	var (
+		found bool
+		isDot bool
+	)
 	for x := 0; x < len(data); x++ {
 		if data[x] == '(' {
 			x = skipComment(data, x)
@@ -205,12 +208,17 @@ func parseLocalDomain(data []byte, allow []byte) (out []byte) {
 			out = append(out, data[x])
 			continue
 		}
+		found = false
 		for _, c := range allow {
 			if c == data[x] {
 				out = append(out, data[x])
+				found = true
 				break
 			}
 		}
+		if found {
+			continue
+		}
 		if data[x] == '.' {
 			isDot = true
 			continue