Lots of spam after UPN change

In preparation for a move from premises based Exchange 2010 to Office365 we recently started to change our UPNs from local domain to external domain (i.e. change UPNs from mycompany.local to mycompany.co.uk).
About 24 hours after the change our email users started receiving lots of spam.
What could be the cause of this?

Hi,
Does the issue happen to all users? Please confirm if the spam message is send from internal or external users.
Please check the SCLJunkThreshold parameter configured in your organization. We can refer to the following article to set Anti-Spam to your mailboxes:
http://technet.microsoft.com/en-us/library/bb123559(v=exchg.150).aspx
Anti-Spam Protection in Exchange 2013
http://technet.microsoft.com/en-us/library/jj218660(v=exchg.150).aspx
Regards,
Winnie Liang
TechNet Community Support

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