Microsoft 365 or Office 365 responds to these abnormal influxes of mail by returning a temporary non-delivery report error (also known as an NDR or bounce message) in the range 451 4.7.500-699 (ASxxx). In Microsoft 365 and Office 365, graylisting slows down suspiciously large amounts of email by throttling the message sources based on their IP addresses. Graylisting is a delay tactic that protects email systems from spam. Relay mail from devices, applications, or other non-mailbox entities in your on-premises environment through Microsoft 365 or Office 365.Īvoid graylisting that would otherwise occur due to the large volume of mail that's regularly sent between your Microsoft 365 or Office 365 organization and your on-premises environment or partners. What do connectors do?Ĭonnectors are used in the following scenarios:Įnable mail flow between Microsoft 365 or Office 365 and email servers that you have in your on-premises environment (also known as on-premises email servers).Īpply security restrictions or controls to email that's sent between your Microsoft 365 or Office 365 organization and a business partner or service provider. This article describes the mail flow scenarios that require connectors. Actually, most Microsoft 365 and Office 365 organizations don't need connectors for regular mail flow. Connectors are a collection of instructions that customize the way your email flows to and from your Microsoft 365 or Office 365 organization.
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