Office 365 SMTP relay

Office 365 SMTP relay

• https://learn.microsoft.com/en-us/exchange/mail-flow-best-practices/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-microsoft-365-or-office-365
• https://learn.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#sending-limits-1

MailChimp

• https://mailchimp.com/

Sendgrid

• https://docs.sendgrid.com/for-developers/sending-email/api-getting-started