I have a client who is receiving lots of random and quite obvious spam. I think the spam is being generated by a rogue PC on our network rather than coming from outside, but I need advice on how to track this down. I have a Draytek router. I blocked port 25 for everyone except our Exchange Server and enabled syslog but I don't know how to find or interpret the output. Can someone please provide some useful guidance here. Thanks.
You can use any one of the below link which state same problem and they have solution for this :
This video shows how to remove a single email address from the Outlook 2010 Auto Suggestion memory.
NOTE: For Outlook 2016 and 2013 perform the exact same steps.
Open a new email: Click the New email button in Outlook.
Start typing the address: …
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