how to block spam from domain @*********.com? I block send but it just changes the user and they're all from same domain.
@******.com is 100% SPAM and cannot block the domain
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The best you can do is to report those messages as spam. (https://help.yahoo.com/kb/SLN3402.html) Depending on the number of similar reports, our Anti-Spam filter may take some time to react and start actively blocking them from reaching you.
In the meantime, you can either create filters (https://help.yahoo.com/kb/mail-for-desktop/SLN15994.html?impressions=true) or block those email addresses:
https://help.yahoo.com/kb/mail-for-desktop/SLN16025.html?impressions=true