Last 2 days have got thousands of Emails.."Your message did not reach some or all...". The subject line commences 'Undeliverable:.
I run Exchange server and when I down the server that Exchange runs on there appears to be none of these mails arriving to my mail box when I monitor it from the Web mail access. This is only affecting my mailbox and despite running AVG on the server and running Stinger on the server in Safe Mode there is no detected virus. The headers of the messages all refer to "Received from: saturated (18.104.22.168) which on tracert shows as a Brazilian IP address. Any ideas