Some of the APIs we covered above, like the Mailgun and Gmail APIs, provide free APIs that let you send emails at scale. However, free APIs usually have daily sending limits — for instance, you can only send up to 5000 emails per month with Mailgun’s free API. To send more emails, you’ll have to upgrade to a paid plan. Gmail implements a daily email sending limit to regulate the volume of outbound emails. As of August 2023, standard Gmail accounts typically have a maximum of 500 emails in a 24-hour period, and a Go to Accounts and Import settings > Grant access to your account > Add another account. Enter delegate's email address and follow steps. Revoke access: Go to Accounts and Import settings. Under Grant access to your account, next to delegate's email, select Delete > OK. Log in as delegate: In your account, select your profile icon. In the Admin console, go to Menu Directory Users. To open the user settings page, click a user's name. If you need help with finding the user in the list, go to Find a user account. On the left, under the user's name, click Add Alternate Emails. Next to the email alias, click Remove . Note: If you don’t see Remove, the alias was automatically Office 365 Exchange Online is not used for Bulk sending emails. If you send lots of emails and exceed the limit of Office 365, the user or tenant may be blocked from sending emails. I think 150 recipients one email is fine but don't exceed 10,000 recipients per day. Sending limits across Office 365 options. For more information, please refer to Yet Another Mail Merge pricing includes: Individual plans: Basic: free plan – send up to 50 emails per day for one Gmail account. Gmail.com Premium: $20/year – send up to 400 emails per day for one Gmail account + scheduling features + tech support. G Suite Individual: $40/year – send up to 1500 emails per day for one G Suite account .

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