There was a 4 hours delay on hop 4.
Code:
Hop Delay From By With Time (UTC)
1 * excmbx-14.um.gwdg.de fe80::59fd:666a:7751:299b excmbx-14.um.gwdg.de fe80::59fd:666a:7751:299b mapi 12/16/2019 9:36:31 AM
2 * excmbx-14.um.gwdg.de 134.76.9.225 excmbx-24.um.gwdg.de 134.76.9.234 Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) 12/16/2019 9:35:58 AM
3 1 minutes excmbx-24.um.gwdg.de 134.76.9.234 mailer.gwdg.de esmtp (GWDG Mailer) (envelope-from <YYY@YYY>) 12/16/2019 9:37:06 AM
4 4 hour gmailer.gwdg.de 134.76.11.17 mx-ha.gmx.net 212.227.17.5 ESMTPS (Nemesis) 12/16/2019 2:02:46 PM
BTW, email is not suitable for instant messaging. Delay is always possible due to the nature of how email communication is built.