This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: stieltjes@math.leidenuniv.nl host math-leidenuniv-nl.e-v1.mx.microsoft [52.101.73.16] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. For more information see https://aka.ms/EXOSmtpErrors [AMS0EPF00000198.eurprd05.prod.outlook.com 2025-10-18T18:55:18.661Z 08DE0D415A13C799] stien.vdc@telenet.be host mx1.telenet-ops.be [195.130.132.8] SMTP error from remote mail server after RCPT TO:: 550 5.1.1 recipient address rejected: User unknown stiel@numerica.it host mx02.a2asmartcity.it [81.88.231.49] SMTP error from remote mail server after RCPT TO:: 550-Callout verification failed: 550 550 User not found stiefe5@centrum.cz host mx-ttc.eco-mx.cz [46.255.227.8] SMTP error from remote mail server after initial connection: 554-antispam85.centrum.cz 554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means. stiefe2@centrum.cz host mx-ttc.eco-mx.cz [46.255.227.8] SMTP error from remote mail server after initial connection: 554-antispam85.centrum.cz 554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means. stieberitz.jessika@gmx.de host mx00.emig.gmx.net [212.227.15.9] SMTP error from remote mail server after initial connection: 554-gmx.net (mxgmx007) Nemesis ESMTP Service not available 554-No SMTP service 554-Bad DNS PTR resource record. 554 For explanation visit https://postmaster.gmx.net/en/case?c=r0601&i=ip&v=101.100.194.80&r=1MK3iO-1uvHre1w1m-00TF8O stick00@giochi0.it host mx.giochi0.it [104.131.176.42] SMTP error from remote mail server after end of data: 554 Transaction 68f3e294-6564c250@giochi0.it failed - Remote said: "Reputation too low" stiblaa@orstaskulen.no host ASPMX.L.GOOGLE.COM [172.253.118.27] SMTP error from remote mail server after RCPT TO:: 550-5.1.1 The email account that you tried to reach does not exist. Please try 550-5.1.1 double-checking the recipient's email address for typos or 550-5.1.1 unnecessary spaces. For more information, go to 550 5.1.1 https://support.google.com/mail/?p=NoSuchUser d2e1a72fcca58-7a230126eadsi1834817b3a.824 - gsmtp stiel-und-bluete@t-online.de host mx02.t-online.de [194.25.134.9] SMTP error from remote mail server after initial connection: 554 IP=101.100.194.80 - None/bad reputation. Ask your postmaster for help or to contact tobr@rx.t-online.de for reset. (NOWL) stieberflorian@t-online.de host mx02.t-online.de [194.25.134.9] SMTP error from remote mail server after initial connection: 554 IP=101.100.194.80 - None/bad reputation. Ask your postmaster for help or to contact tobr@rx.t-online.de for reset. (NOWL) stiastnyk@t-online.de host mx02.t-online.de [194.25.134.9] SMTP error from remote mail server after initial connection: 554 IP=101.100.194.80 - None/bad reputation. Ask your postmaster for help or to contact tobr@rx.t-online.de for reset. (NOWL) stiasny-kolster@schlaflabor-marburg.de host w0177eba.kasserver.com [85.13.145.101] SMTP error from remote mail server after RCPT TO:: 550-5.7.1 Service unavailable; client [101.100.194.80] blocked using mail.badip.de 550 5.7.1 please see https://kasserver.com/rbl/ stian@totalbetong.no host totalbetong-no.mail.protection.outlook.com [52.101.73.11] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. For more information see https://aka.ms/EXOSmtpErrors [AM3PEPF0000A78E.eurprd04.prod.outlook.com 2025-10-18T18:55:09.387Z 08DE0E1E6B0F43CF] stian.loklingholm@xl-bygg.no host xlbygg-no0e.mail.protection.outlook.com [52.101.68.39] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. For more information see https://aka.ms/EXOSmtpErrors [DU2PEPF00028CFC.eurprd03.prod.outlook.com 2025-10-18T18:55:07.279Z 08DE0D24573C8541] stian.hauge@ridge.no host ridge-no.mail.protection.outlook.com [52.101.99.2] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. For more information see https://aka.ms/EXOSmtpErrors [CW2PEPF000056BA.GBRP265.PROD.OUTLOOK.COM 2025-10-18T18:55:07.234Z 08DE0D2F7C012193] stian.halsen@nucc.no host nucc-no.mail.protection.outlook.com [52.101.73.11] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. For more information see https://aka.ms/EXOSmtpErrors [AM3PEPF0000A792.eurprd04.prod.outlook.com 2025-10-18T18:55:07.311Z 08DE0D485B13190B] stian.lundoy@start.no host mx.dka.mailcore.net [194.19.134.90] SMTP error from remote mail server after RCPT TO:: 550 5.1.1 : Recipient address rejected: User unknown in relay recipient table