Anti-Spam features are enabled by default, there is no requirement for the customers to activate anything.
However, like any other anti-spam appliance, there are situations where the end-user will receive e-mails they consider to be SPAM.
Should it be the case, the mails should be reported, following the process defined in this document : Reporting spam
This document can be found in the Product Documentation
Product Documentation > Administering SmartCloud Notes: Service-only Environment > Administering user accounts > Reporting spam
Regarding the second question and the error message "Web Server Connection Error - Please try later", it could be related to several different things, including network connection issues, or browsers interpretations of specific situations.
In case the problem would be reproducible with a supported browser (see the list here
) and would not be sporadic, could you provide more details about the browser (name and version), and also about the different occurrences it happened ? Was it happening permanently, sporadically, from specific locations (home office, company network, mobile broadband...) ?
I hope this helps.