Due to the maintenance of the following Kyoto DC, the mail delivery will be delayed around 1:00-2:00 on Dec.17.
http://www.iimc.kyoto-u.ac.jp/en/whatsnew/maintenance/detail/181026055299.html

1. Sending the mail sent from on-campus
The error mail saying there's no reply from sender will be delivered however it will be sent late.
Could you avoid from sending on that time unless it was urgent?

2. Receiving the mail sent from off-campus
Recipients can't get the mail from off-campus temporary however the mail will be sent late if you use the normal mail service.