Why can't I lower the spam filtering level for some forwarding addresses?
Although we don't recommend it, it is possible to set the spam filtering level to "Low" or "Off" in some cases.
However, if you're forwarding your mail to other companies that track or reject spam (including AOL, Comcast, Gmail, Yahoo, MSN, Hotmail or Mac.com addresses), you'll need to choose the recommended "High" spam filtering.
That's because those services will block all forwarded messages if the percentage of spam gets too high. If we don't apply strong spam filtering, our servers will send them spam and they'll block all mail from us.
If you really want to receive mail with lowered spam filtering, you can set up a mailbox on our servers and deliver your mail there instead. Or technically advanced users may instead prefer to deliver their mail directly to Gmail, for example, bypassing our spam filters entirely.
In addition, you can't turn spam filtering completely off for a catch-all address, because spammers sometimes try sending thousands of messages to different random addresses in a short time. Turning off all spam filtering for a catch-all address would completely fill up your mailbox. If you want to disable spam filtering for an address, add that specific address in the control panel instead of relying on the catch-all.