Top Deliverability’s Blog
Spam Resource: All the different bounces you can get from O365
- December 19, 2023
- Posted by: Top Deliverability
- Category: Industry News Spam Resource
Al Iverson just published a interesting article on Spam Resource:
Bounce message. SMTP rejection. Deferral message. Non-delivery report (NDR). 5xx error. 4xx error. No matter what you call them, there are a zillion different kinds of them out there. Heck, Microsoft’s got at least four different ways to tell you “user unknown.” Memorizing all of these is hard. Probably impossible. So, if you’re looking for a big ole’ list of all (or at least most) of the different rejections or deferrals you can run into when sending emails to Microsoft, let’s be grateful that they’ve got a very handy chart that breaks down just about all of the different types of 4xx and 5xx responses you can receive when trying to send to Exchange Online / Office 365. There are close to 70 different types of NDRs listed; and it’s a good and handy resource that you should bookmark, though I admit that I don’t know if it covers absolutely
Continued here: All the different bounces you can get from O365
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