fix(mail): propagate io.ReadAll errors when parsing parts

internal/mail/message.go

@@ -3,6 +3,7 @@ package mail
 
 import (
 	"bytes"
+	"fmt"
 	"io"
 	"strings"
 
@@ -72,13 +73,19 @@ func ParseMessage(uid uint32, raw []byte) (Message, error) {
 		case *mail.InlineHeader:
 			ct, _, _ := hdr.ContentType()
 			if strings.HasPrefix(ct, "text/plain") && m.BodyText == "" {
-				b, _ := io.ReadAll(part.Body)
+				b, err := io.ReadAll(part.Body)
+				if err != nil {
+					return Message{}, fmt.Errorf("read message part: %w", err)
+				}
 				m.BodyText = string(b)
 			}
 		case *mail.AttachmentHeader:
 			name, _ := hdr.Filename()
 			ct, _, _ := hdr.ContentType()
-			b, _ := io.ReadAll(part.Body)
+			b, err := io.ReadAll(part.Body)
+			if err != nil {
+				return Message{}, fmt.Errorf("read message part: %w", err)
+			}
 			m.Attachments = append(m.Attachments, Attachment{
 				Name: name, Size: len(b), MIME: ct, Content: b,
 			})