How to block someone from sending me emails in yahoo mail?

Spammers are smarter than spam filters. It's time to stop hiding and start fighting. Here are some tools that will help: Traceroute is available at http://www.opus1.com/www/traceroute.html ARIN whois on IP numbers is available at https://ws.arin.net/whois/ How to use them? Well, at those sites, read any available advice on how to interpret what they mean. You will need to open the email to show complete headers. Different programs have different ways to select this. Sometimes it is called "View Source". In Yahoo Classic, you will find a link "Full Headers" to the bottom right of the message. In new Yahoo right click on the subject in the mailbox to bring up choices that include Full Headers. You need these, because spammers can forge addresses, but somewhere in the headers are probably IP (a.k.a. DNS) numbers that will identify their hosting service. They are in four groups of 1-3 digits. There may be more than one. Some may be from the internal network, some will be from the provider used to access the internet, some may be from an additional site (e.g. webmail), some may be forged, and some may or may not be added by your own email service. In general, deeper is usually close to the spammer. If the ones at the top are for your own service provider, look deeper. The headers should have numbers that will enable the host to identify the account that was used. It's a good idea to open a text editor like Notepad to keep notes when you are working up a spam. Look up the IP numbers in the whois of the Regional Internet Registry (RIR). There are five in the world, and the one to use depends on the location of the spammer's host. I usually start with ARIN. U.S. and Canada https://ws.arin.net/whois/ Asia Pacific http://www.apnic.net/apnic-info/whois_search2 Africa http://www.afrinic.net/ Latin America http://lacnic.net/en/index.html Europe http://www.db.ripe.net/whois The spamvertiser is the company for whom the spam was sent. If there is a link in the email, the displayed text may not show it correctly. Right click on the link, and select Copy Shortcut. Paste that into your notes. Find the domain and do traceroute to resolve it to its IP number, which it should do at the top of the traceroute report. Copy that number to your notes. Do ARIN lookup. It may be safer to skip the above step (unless you are using linux or a Mac). Sometimes the link will trigger downloads of malware if you left click it. For example, if I do traceroute on yahoo.com, it shows me IP number of 209.191.93.53, which ARIN shows is registered to Yahoo. Get the abuse address for the host of the spamvertiser. You can now forward the spam, with full headers displayed, to the abuse departments. I like to include a note that says something like: Spam from [ip number from header] hosted by [registrant of that IP number] for spamvertiser [link from coped shortcut] at [ip number from traceroute] hosted by [registrant of that IP number] Some email programs will include the headers when you forward, but Yahoo trims them out. To make this work, with the spammers message open and Full Headers selected, select and copy the headers. Paste into your notes. In your forwarding you can write: "Here are full headers" and copy them from your notes and paste them in above the forwarded body of the spam. I like to send a Bcc to myself to show that my email, went through, to keep a record of the report, and to see how it is displayed to the recipient. Source(s): http://www.opus1.com/o/nospamtrace.html http://www.apnic.net/apnic-info/whois_search/abuse-and-spamming

On the mail screen click Options, then click Mail Options, on the list to the left click Spam. Enter the address in the block, click Add Block, upper left click Save Changes. They will not get a notice of the block, it won't be returned to them, it will be deleted upon arrival at your account.