So how do spam trends related to cloud computing? It all depends on how you block and fight SPAM.
According to the Q2 2009 Spam Trends report published by the team at Google Postini Services, spammers have developed means of releasing days worth of spam in just hours. If you are manage spam from within your network, this means your Internet connectivity and servers are more susceptible to performance degradation and failure.
Across our customer base, ~92% of email is spam. Most spam is sent to invalid email addresses. This traffic chews up bandwidth inbound. If it hits your servers, it increases the disk space used for log files as well as outbound bandwidth for non-delivery report messages.
If you stop spam in the cloud, you protect your network and server performance regardless of the volume of spam targeting your domain.