Outgoing mail delays
Since 22:17 on 26th February, some outgoing mail from the SRCF has been experiencing delays (in some cases, of several hours). This is due to connectivity problems with the University’s central mail servers.
We are working with the University Computing Service to investigate and resolve the problem. Meanwhile, apologies for the disruption.
Update 19:45: we deployed a workaround at 18:20; there should be no further delays.
The cause was an interoperability bug in the TLS implementations (leading to “Bad record MAC” errors and aborted SMTP connections) between our mail server and the University’s; previously these connections generally hadn’t used TLS at all until the University Computing Service enabled it last night.