Gmail includes built-in support for LISTSERVs, which are mailing lists. You can use the contact-grouping in Gmail's contacts editor to create groups of email addresses. You can specify the name of the contact group while composing an email, as a means of sending the same email to the entire mailing list at once. Gmail's contact-grouping feature is intended for small, personal mailing lists. If you want to create a large, commercial mailing list, Google recommends using Google Groups instead of Gmail for this purpose.
Open the Gmail Web page at Mail.Google.com and click "Contacts" at the left side of the Gmail page.
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Click "New Group" at the left side of the contacts list, type a name for your mailing list and press "Enter."
Click the name of your mailing list at the left side of the contacts list.
Click the "Add to [Group Name]" button at the top of the contacts pane, type a comma-separated list of the email addresses you want on your mailing list and press "Enter."
Click "Mail" at the left side of the page and click "Compose Mail."
Type the name of your mialing list group into the "To" box and click "[Group Name] (Group)" in the drop-down box. Gmail automatically adds each email address in the group as a recipient.
Compose the email normally, filling out the subject and body, and then click "Send" to send the email to every email address on your mailing list.