Gmail is a robust online e-mail service that allows you to create detailed contact lists, organise your inbox and prioritise the email you receive with labels and groups. However, if you're receiving unwanted mail from someone, you may want to block them altogether. Gmail's block feature works by filtering out the sender's incoming e-mails and circumventing them to an unseen folder--in this case, the "Trash" folder. To block an e-mail address and make the sender aware that you've blocked the address, you must create a filter blocking the email address, then notify the sender with a follow-up e-mail.
Log in to your Gmail account. Visit gmail.com and enter the email address and password for the account from which you wish to block the sender.
Click the small blue "Create a Filter" link next to the "Search the Web" button near the top.
Type the email address you wish to block in the "From" field.
Click the "Next Step" button.
Check the box next to the "Delete" option. This will automatically move all the e-mails you receive from this e-mail address to the trash. Gmail will block you from ever seeing these e-mails unless you read your deleted e-mails.
Click the "Compose Mail" button to create a new e-mail.
Enter the blocked sender's e-mail address in the "To" field.
Type a brief message letting the blocked sender know you have blocked all incoming e-mails from that e-mail address and you will not see any replies or new correspondence the person sends.
Click the "Send" button to send the email. If the person replies from the same address, you will not see the e-mails.
To block incoming e-mails based on other criteria, such as the person's first or last name or the words in a signature line, enter those words in the "Has the Words" field when creating your filter. If you send and receive your Gmail from a mail client such as Outlook, you can create special rules to block senders and to automatically respond with a notice you have blocked the email address each time the sender tries to e-mail you.
Courtesy counts. While letting someone know you've blocked any of his incoming e-mails can be uncomfortable, doing so as respectfully as possible may help take the sting out of any perceived rejection, and may reduce the chances that the person will simply start e-mailing you from a completely different e-mail address.