Article ID: 2624610 - View products that this article applies to.
Not sure what release of Office 365 you're using? Go to the following Microsoft website:
Am I using Office 365 after the service upgrade?
In a Microsoft Office 365 pre-upgrade environment, your outgoing (also known as "outbound") email message delivery is delayed or rejected in Microsoft Forefront Online Protection for Exchange (FOPE). Additionally, you receive the following nondelivery report (NDR) error message:
This issue can occur if the receiving domain enforces a retry period that's designed to block spam. This causes message delivery to fail because greylisting blocks all senders until they pass the greylisting test at least one time. Greylisting systems frequently encounter issues when they retry from different Message Transfer Agents (MTAs).
To resolve this issue, follow these steps:
For more information about greylisting, go to the following website:
http://projects.puremagic.com/greylisting/whitepaper.htmlThe receiving mail server tries to validate a sender by using a triplet set of information. To form a triplet, this server checks the following three pieces of information about any particular mail delivery attempt:
Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.
Still need help? Go to the Office 365 Community
Article ID: 2624610 - Last Review: June 19, 2013 - Revision: 5.0