Click on Options, upper right corner of mail page. Then Mail Options. Click on Spam from the list on the left. In the Add a blocked address box, enter the domain. The domain is the part of the email address after address AFTER the @. Leave out the @ symbol). Click the Add button.
You can report messages as junk in the Mail app and help filter junk mail in i Cloud. Then future messages from the same sender are marked as junk. To mark a message as junk: On your i Phone, i Pad, or i Pod touch with i OS 7 or later, open the message, tap the Flag at the bottom, then tap Move to Junk.
You can store messages in an Archive mailbox—for example, to quickly find them later when you're ready to take action. ... View archived messages: When you archive messages, Mail creates an archive mailbox in the Mail sidebar for each account whose messages you're archiving, and moves the messages you selected there.
Unlike Outlook, when you Archive a message in Gmail, the message is hidden from your Inbox view. So in effect, archiving lets you tidy up your inbox by moving messages from your inbox into your All Mail label, so you don't have to delete anything.
Change the junk mail filter To easily verify what Mail identifies as junk mail, select “ Mark as junk mail, but leave it in my Inbox.” If you're sure the filter accurately identifies junk mail, select “ Move it to the Junk mailbox.” To set up other actions, select “ Perform custom actions,” then click Advanced.
Go to Settings -> Mail, Contacts, Calendars and tap your Gmail account. Tap Account -> Advanced to bring up more options. Tap ' Deleted Mailbox' under the heading, Move discarded messages into; you'll see that the default option is ' Archive Mailbox'. Tap Account and then Done to confirm the changes.