How to Blocklist a Sender or Domain in Zoho Mail
To prompt Zoho Mail to delete messages from a certain sender or an entire domain automatically, log in to your Zoho Mail account then visit the URL for the Anti-Spam Lists configuration page. From the top row of the window, select either Email address or Domain. The former specifies specific addresses; the latter specifies domains — i.e., everything after the @ sign in an email address. Add new addresses next to the plus symbol; delete existing items by selecting them then clicking the trash-can icon in the list. Within these lists, you’re presented with two options. Whitelist means that any mail coming from that domain or address is automatically trusted and will never be routed to your spam folder. Blacklist means the mail will always route to your spam folder, automatically.
Filter Collision
Because your settings work for all mail, not just for when you’re logged into the web interface, you may run into situations where the behavior you see isn’t the behavior you intended. When blocks and filters work at both the server and the client level, in general, what happens at the server applies first — so an email address blocked on the anti-spam blocklist will never push to your email program. However, addresses that might be safelisted in Zoho Mail, but configured as spam in your email program, may end up in the spam folder anyway. It’s good practice to use just one source of filtering — either your email program or the email server. Using both with inconsistent settings may lead to unpredictable delivery results.
