This is the mail system at host smtp1.osuosl.org.

I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can delete your own text from the attached returned message.

The mail system

eroob0530@outlook.com: host outlook-com.olc.protection.outlook.com[52.101.73.25] said: 550 5.5.0 Requested action not taken: mailbox unavailable (S2017062302). [AM2PEPF0001C716.eurprd05.prod.outlook.com 2025-08-19T13:29:23.402Z 08DDDC39503F95C4] (in reply to RCPT TO command)