All mail to your addresses passes our spam and virus filter before it reaches a mailbox. You do not have to set anything up.
What happens to a message
- Clean messages are delivered as usual.
- Viruses and messages with dangerous attachments are blocked and not delivered.
- Spam with a high score is blocked and not delivered.
- Messages that only might be spam are delivered; your mail program or webmail may mark them as junk.
Many spam attempts never get that far: servers on public spam blocklists, and mail to addresses that do not exist at your domain, are refused before the message is even accepted.
Seeing what the filter did
The mail log shows every message to your addresses. Blocked under Messages means the filter stopped it; Details shows the verdict (spam, virus, forbidden attachment) and the spam score: the higher, the more certain. Mail refused earlier is under Refused, with the reason.
A real message was blocked
It happens rarely, for example with mass mailings or badly configured sending servers. Open a ticket with the mail server and queue id from the message details in the mail log; we can check why it was blocked. The sender can also often fix it on their side: missing SPF or DKIM records on their domain are a common cause.
Spam that got through
Delete it, or mark it as junk in your mail program so it learns. Never answer spam or click its links. If a lot gets through to one address, a forwarder or catch-all may be collecting it: see Forwarders and catch-all addresses.
Your own mail ending up as spam elsewhere
That depends on the receiving provider and on your domain's DNS records: see Improve email deliverability: SPF, DKIM and DMARC.