[Minor] Fix ownership issue

src/libmime/received.cxx

@@ -629,15 +629,9 @@ received_header_parse(received_header_chain &chain, rspamd_mempool_t *pool,
 			}
 			break;
 		case received_part_type::RSPAMD_RECEIVED_PART_FOR:
-			rh.for_addr = rspamd_email_address_from_smtp(part.data.data(),
-					part.data.size());
-
-			if (rh.for_addr) {
-				if (rh.for_addr->addr_len > 0) {
-					rh.for_mbox = std::string_view{rh.for_addr->addr,
-												   rh.for_addr->addr_len};
-				}
-			}
+			rh.for_mbox.assign_copy(part.data);
+			rh.for_addr = rspamd_email_address_from_smtp(rh.for_mbox.data(),
+					rh.for_mbox.size());
 			break;
 		default:
 			/* Do nothing */

src/libmime/received.hxx

@@ -103,7 +103,7 @@ struct received_header {
 	mime_string real_hostname;
 	mime_string real_ip;
 	mime_string by_hostname;
-	std::string_view for_mbox;
+	mime_string for_mbox;
 	struct rspamd_email_address *for_addr = nullptr;
 	rspamd_inet_addr_t *addr = nullptr;
 	struct rspamd_mime_header *hdr = nullptr;
@@ -128,7 +128,7 @@ struct received_header {
 			real_hostname = std::move(other.real_hostname);
 			real_ip = std::move(other.real_ip);
 			by_hostname = std::move(other.by_hostname);
-			for_mbox = other.for_mbox;
+			for_mbox = std::move(other.for_mbox);
 			timestamp = other.timestamp;
 			flags = other.flags;
 			std::swap(for_addr, other.for_addr);
@@ -159,7 +159,7 @@ struct received_header {
 			rh.from_ip = map.at("from_ip"sv);
 		}
 		if (map.contains("for_mbox")) {
-			rh.for_mbox = map.at("for_mbox"sv);
+			rh.for_mbox.assign_copy(map.at("for_mbox"sv));
 		}
 
 		return rh;
@@ -185,7 +185,7 @@ struct received_header {
 			map["from_ip"] = from_ip;
 		}
 		if (!for_mbox.empty()) {
-			map["for_mbox"] = for_mbox;
+			map["for_mbox"] = for_mbox.as_view();
 		}
 
 		return map;