550 5.1.90 NDR
Problem: NDR "Remote Server returned '550 5.1.90 Your message can't be sent because you've reached your daily limit for message recipients." Question 1: the code 550 5.1.90 doesn't exist under code description - can MSFT fix it? https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/non-delivery-reports-in-exchange-online Question 2: There are two recipient limits - Recipient rate limit & Recipient limit. Which one has been exeeded in case of 550 5.1.90? Question 3: How to find in Exchange Online / M365 Security a report that shows all NDRs for a domain?
Mail to Team Cannel - Remote Server returned '554 5.4.0'
Hi I have a strange effect with sending Mail to a Teams Channel. If send an external User user1@domain.com a mail to the Teams channel, the recive a NDR with the following text Remote Server returned '554 5.4.0 < #5.4.182 smtp;554 5.4.182 Problem occurred during the delivery. Exception Message:The remote server returned an error: (400) Bad Request.>' If an other external user from the same Company user2@domain.com send a Mail will delivered to the teams Channel.
IMCEAEX NDRs 50% solved - Exchange 2013
Hello, After DB corruption and re-creating two mailbox accounts, adding new X500 email address entries (based on email NDRs "mailto:" fields) and deleting cached contact information in outlook clients, I've ended up with a functional account and the other account (let's say ABC@smoothe.com) not being able to receive emails. The weird thing is, outlook clients are caching the contact with a typo from somewere I'm not being able to find nor fix. Even weirder, users are able to send emails for a first time if they delete cached contact information and then type the email address manually, but on a second attempt they receive a NDR message with the wrong X500 email address. Exchange side X500 entry: /o=corp123/ou=Exchange Administrative Group (FYDIBOHF4141415)/cn=Recipients /cn=ABC@smooth.com Outlook NDR: /o=corp123/ou=Exchange Administrative Group (FYDIBOHF4141415)/cn=Recipients /cn=ABzC@smooth.com I've restarted several services and tried restarting the server. No luck. Did I missed something when re-creating the mailboxes in the Exchange Server? Thanks in advance! Max
