I' not sure, if I understand the translation correctly... but to be able to find out, which mails you received, you have to use an IMAP extension
-
IMAP Client Extension by vknow360 (6 USD) to read emails from IMAP server
-
Mailer Extension (Beta) by alegoriasoft, which offers SMTP, POP3 and IMAP
Taken from the extensions directory App Inventor Extensions | Pura Vida Apps
Taifun