All popular email services -- including Gmail, Yahoo Mail and Outlook.com -- allow you to send emails to several contacts or email addresses at once. You can send group emails from any of the three email services, as long as you don't repeatedly send unsolicited emails to people you don't know -- the email service may consider this spam and penalize you. You can add both existing contacts and new email addresses to your group email, but restrictions on the number of recipients may apply.
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Sending Group Emails from Gmail, Yahoo Mail and Outlook.com
Log in to your Gmail account and then click the Compose button to create a new message. The new message dialog displays.
Start typing the name of the first person and then click her name in the list of suggestions to add the to the recipients list.
Type more names and add the contacts to the recipients lists. To add email addresses that are not in your contacts list, type each email address and press Space.
Compose the group email and click the Send button to send it to the recipients.
Log in to your Yahoo Mail account and then click the Compose button to create a new email.
Start typing the name of the first recipient and then click his name in the list of suggestions to add the contact to the recipients list.
Add more contacts to the recipients list by typing their names and selecting them from the list of suggestions.
Compose the email and click the Send button to send it to the group.
Log in to your Outlook.com account and click the New button to create a new message.
Type the name of the contact and select it from the list of suggestions to add it to the recipients list.
Type more names and add them to the recipients list. You can send emails to people who are not in your contacts list by typing their full email address and pressing Enter or putting a comma after the address.
Compose the email and then click the Send button.
Blind Carbon Copy
If you add the contacts to the To field, each contact can see all other contacts that received the group email. To hide recipients in email messages, add the contacts to the blind carbon copy -- Bcc -- field.
Gmail, Yahoo Mail and Outlook.com support blind carbon copy. Click the Bcc link next to the To field to display the Bcc field and add the contacts and email addresses.
Email services typically restrict the number of recipients that you can email at one time to prevent spam and unsolicited emails.
Gmail temporarily disables your account if you attempt to send an email to more than 500 contacts -- the service typically re-enables it within 24 hours.
Yahoo Mail doesn't disclose the recipient limit, but it does look for suspicious activity. If the service considers that your group emails are spam, it may restrict or close your account.
You can include up to 100 contacts in an Outlook.com email and can send up to 300 messages in 24 hours. In other words, you can send a maximum of three group emails that contain a maximum of 100 recipients in any 24-hour period.