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Performance Issue: Email from Cornell to Office 365

Last Updated:
2018-03-05 09:52:45
Event:
2018-02-28 09:00:00
Status:
Closed
Brief Description:
On Thursday, February 28, 2018 some mail was rejected from some Cornell campus sources to Office 365, with a message of "Service unavailable. Client blocked from sending from unregistered domains." Microsoft fixed this problem around 6:15pm that evening.
User Impact:
N/A
Workaround:
There is no workaround for this issue
Current Status:
No new reports of this problem have occurred. A message was sent Thursday afternoon to everyone who didn’t receive email sent to them. The message listed the emails the intended recipients didn’t get so that they could decide whether to contact the senders and ask for the emails to be re-sent.
Services Affected:
Email and Calendar
Subsites Affected:
Faculty/Staff Email (Office 365)
Student Email (Cmail)
Full Description:
On Thursday, February 28, 2018 some mail was rejected from some Cornell campus sources to Office 365, with a message of "Service unavailable. Client blocked from sending from unregistered domains." Microsoft fixed this problem around 6:15pm that evening.

Some students have reported that individuals attempting to send them an email have gotten a message that it was not delivered. Any student who is using Cmail should check for the expected email there. Delivery to Cmail was not affected, even though Office 365 may have sent a non-delivery message to the sender.



Timeline of Changes

Description Current Status Date Time
On Thursday, February 28, 2018 some mail was rejected from some Cornell campus sources to Office 365, with a message of "Service unavailable. Client blocked from sending from unregistered domains." Microsoft fixed this problem around 6:15pm that evening. Some students have reported that individuals attempting to send them an email have gotten a message that it was not delivered. Any student who is using Cmail should check for the expected email there. Delivery to Cmail was not affected, even though Office 365 may have sent a non-delivery message to the sender. No new reports of this problem have occurred. A message was sent Thursday afternoon to everyone who didn’t receive email sent to them. The message listed the emails the intended recipients didn’t get so that they could decide whether to contact the senders and ask for the emails to be re-sent. 2018-03-05 09:52:45
On Thursday, February 28, 2018 some mail was rejected from some Cornell campus sources to Office 365, with a message of "Service unavailable. Client blocked from sending from unregistered domains." Microsoft fixed this problem around 6:15pm that evening. Some students have reported that individuals attempting to send them an email have gotten a message that it was not delivered. Any student who is using Cmail should check for the expected email there. Delivery to Cmail was not affected, even though Office 365 may have sent a non-delivery message to the sender. A message has been sent to all individuals to whom email was not delivered, letting them know the subject and source of each, in case they want to request an email be sent again. 2018-03-01 15:07:06
There have been reports of mail being rejected from some Cornell campus sources to Office 365, with a message of "Service unavailable. Client blocked from sending from unregistered domains." Cornell has contacted Microsoft to investigate the problem. Some students have reported that individuals attempting to send them an email have gotten a message that it was not delivered. Any student who is using Cmail should check for the expected email there. Delivery to Cmail is not being affected, even though Office 365 may have sent a non-delivery message to the sender. A message has been sent to all individuals to whom email was not delivered, letting them know the subject and source of each, in case they want to request an email be sent again. 2018-03-01 15:03:18
There have been reports of mail being rejected from some Cornell campus sources to Office 365, with a message of "Service unavailable. Client blocked from sending from unregistered domains." Cornell has contacted Microsoft to investigate the problem. Some students have reported that individuals attempting to send them an email have gotten a message that it was not delivered. Any student who is using Cmail should check for the expected email there. Delivery to Cmail is not being affected, even though Office 365 may have sent a non-delivery message to the sender. Microsoft appears to have made a change at 6:13pm last evening (February 28, 2018) that fixed the issue. Cornell staff are investigating the extent of emails affected and continuing to monitor message flow. 2018-03-01 07:43:55
There have been reports of mail being rejected from some Cornell campus sources to Office 365, with a message of "Service unavailable. Client blocked from sending from unregistered domains." Cornell has contacted Microsoft to investigate the problem. Some students have reported that individuals attempting to send them an email have gotten a message that it was not delivered. Any student who is using Cmail should check for the expected email there. Delivery to Cmail is not being affected, even though Office 365 may have sent a non-delivery message to the sender. CIT has contacted Microsoft to investigate the problem. 2018-02-28 13:48:53
We have received reports that some mail is not being delivered. CIT is working with the vendor. 2018-02-28 13:44:51
There have been reports of mail being rejected from some Cornell campus sources to Office 365, with a message of "Service unavailable. Client blocked from sending from unregistered domains." Cornell has contacted Microsoft to investigate the problem. Some students have reported that individuals attempting to send them an email have gotten a message that it was not delivered. Any student who is using Cmail should check for the expected email there. Delivery to Cmail is not being affected, even though Office 365 may have sent a non-delivery message to the sender. CIT has contacted Microsoft to investigate the problem. 2018-02-28 13:42:19
We have received reports that some mail is not being delivered. CIT is investigating this issue at this time. 2018-02-28 11:36:31
We have recived reports that some mail is not being delivered. CIT is investigating this issue at this time. 2018-02-28 11:04:49