550 5.7.705 Tenant Email Block 55+ Hours - Support Unresolved
Our M365 tenant (labaradorpake.onmicrosoft.com) has been blocked from sending outbound email for over 55 hours with error 550 5.7.705 Access denied, tenant has exceeded threshold. Despite multiple support tickets and promises of 24-hour resolution, the block remains active. **Error Details:** - NDR: 550 5.7.705 Access denied, tenant has exceeded threshold - Scope: External outbound email only is blocked; internal tenant-to-tenant email works fine - Microsoft Defender Restricted Entities page shows 0 restricted users — the block is at tenant level, NOT user level - No transport rules exist that could be blocking outbound - No alerts in Exchange Admin Center **Timeline:** - June 19: Support ticket #2606190040005588 created, agent Manisha confirmed remediation complete and promised block would be lifted within 24 hours - June 21 (55+ hours later): Block STILL ACTIVE. Manisha has not responded to follow-ups. - June 21: Created 2nd ticket #2606210040000778, assigned to agent Odunayo — no action taken - June 21: Created 3rd ticket #2606210040000844 with phone callback request — no callback received yet **What we have tried:** 1. Three Microsoft support tickets (all Sev C) 2. Escalation emails to agent, tech lead, team manager (all bounce due to tenant block preventing outbound email) 3. Support Assistant chat bot — cannot escalate to human agents 4. Azure Portal support — No Access for this tenant tier 5. getsupport.microsoft.com — No Access 6. Microsoft Learn Q&A post: https://learn.microsoft.com/en-us/answers/questions/5926147 7. Phone callback requested on 3rd ticket — still waiting **Critical Impact:** The tenant cannot send ANY external email. All outbound messages to external recipients bounce with 550 5.7.705. This is a complete business email outage that has persisted for over 55 hours despite Microsoft support confirming remediation was complete. Has anyone experienced a similar tenant-level block (550 5.7.705) that took this long to resolve? What escalation paths actually work when support agents are unresponsive? Any advice on getting this block lifted urgently would be greatly appreciated. Cross-posted from Microsoft Learn Q&A: https://learn.microsoft.com/en-us/answers/questions/5926147
Exchange 2010 to Microsoft 365 Migration – Recommended Approach and Tools
I’m looking for guidance on migrating Exchange 2010 (on-premises) to Microsoft 365 / Office 365. Is a direct migration from Exchange 2010 supported, or is an intermediate hop (such as upgrading Exchange or setting up a hybrid configuration) required? Additionally, could you please recommend any reliable tools that can help with this migration? I also have a few PST files that need to be migrated as part of the process. I’d appreciate insights on best practices, common challenges, and lessons learned from real-world migrations. Thanks in advance for your help.
Send admin notifications on x number of messages from an email address
Hi, We're having a problem with a repeat spam/phishing offender that recycles email addresses from a particular domain. Because the email address is new it hasn't had a chance to be picked up by blacklists, so it doesn't get picked up as spam. We can't block on content, subject or sender because it all changes so for these campaigns we're relying on user reports to give us the heads up. We also can't block the domain because we receive legitimate email from the domain also. I'd like to change this so we can hit them before users notice and possibly whilst the spam campaign is in flight but I'm unsure as to how to go about it. Is there a rule or other setting I can configure which sends notifications to specific e-mail addresses if, say 100 emails were received from any email address (or from a specific domain?) within an hour, or 5 hours? I don't see how I can configure such a rule in mailflow rules so I'm guessing this might be somewhere else. There's an element of us likely being falsely alerted to marketing campaigns, but hopefully it's configurable enough that we can limit it down to only applying this against a specific sender domain, or adding a new custom mailflow rule which will lower the likelihood of false positives. Many thanks, - Lsward
Exchange on-prem license
Hello, I have installed ExchangeServerSE x64 iso file its in trial version i want to license it. What kind of license do i need? I have the following information from the EAC: Version 15.2 (Build 2562.17) Standard Trial Edition Trial and from powershell: Edition : StandardEvaluation AdminDisplayVersion : Version 15.2 (Build 2562.17) Since i've installed the ExchangeServerSE x64 is this the correct license i should require? Exchange Server Subscription Edition (SE) license 5 × Exchange Server Standard CALs (one per user/mailbox) Environment details: Exchange version: 2019 (Version 15.2) Number of mailboxes: 5 Is this valid and the correct license? Kind regards, Filip M
Gmail to Microsoft 365 Migration Issue Open for 7+ Days – Seeking Guidance or Escalation Path
I’m facing an issue with a Gmail to Microsoft 365 migration that has been open for more than 7 days, and I’m looking for guidance or an escalation path from the community. Scenario: Migration type: Gmail to Microsoft 365 Issue started: April 22 Current status: Stuck with no clear resolution What’s happening: The support ticket has been active since April 22. However, the updates I’ve been receiving are generic responses such as “we are working on it” and “this has been prioritized.” Despite multiple follow-ups, there has been: No clear root cause identified No ETA provided No technical breakdown of the issue I also requested a callback from the assigned manager and technical lead to better understand the situation, but the communication has remained email-only with repeated status updates. What I’m looking for: Has anyone faced similar issues during Gmail → Microsoft 365 migrations? Are there known blockers or common causes that could lead to this kind of delay? What is the recommended escalation path when support is unable to provide technical clarity or ETA? Any insights, workarounds, or guidance would be highly appreciated. Thank you in advance.
Cross Tenant Migration licensing
Hello, I'm planning a native cross-tenant migration for several shared mailboxes that have archives enabled. I’m looking to confirm if it is necessary to temporarily convert these to user mailboxes in the source to ensure the archive data migrates successfully. Also, what specific licenses should I assign to the target objects specifically, do I need to provide an Exchange Online Plan 2 plus the Cross-Tenant User Data Migration add-on for each shared mailbox? If anyone has handled archived shared mailboxes recently, I’d appreciate a quick confirmation on the cleanest licensing and conversion steps. Thank you in advance ! :)Exchange 2016 Decommission
Hi all, I am trying to decom my 2016 environment and cannot disable (Disable-Mailbox) the final 16 mailboxes (out of thousands). Am getting the error Active directory response: 00002098: SecErr: DSID-03150A45, problem 4003 (INSUFF_ACCESS_RIGHTS), data 0. I have been troubleshooting this for HOURS now. It's not enabling inheritance on the user perms (every article suggests that). The perm exchange trusted subsystem isn't there. The users do not have any admin groups. It's nothing that I can find in the first 6 pages of googling. Sadly, of course, there is no support anymore so can't even raise a ticket. Can't uninstall Exchange with mailboxes left :( Any idea's are more than welcome, please. Thank you.
Is the Archive mailbox self-help diagnostic working for anyone?
Just curious: is the archive mailbox self-help diagnostic at https://aka.ms/PillarArchiveMailbox working for anyone? When I run it, instead of getting results about the user whose UPN I entered, I get this: The following issues were found with your archive mailbox. No account was found for [The UPN of my admin account]. Make sure you've entered the correct email address or create a new account with that name. For more information, see Add users to Office 365. I tried opening a ticket with Microsoft Support, but they refused to work on it without requiring me to do all the legwork of gathering logs and HAR traces and who knows what else, despite the fact that the support agent was able to replicate the exact same issue in his lab.
Issue with certificate renewal for exchange Edge Transport Server
Hello team, I have come across a very particular problem I deployed 2 exchange server 2019 with one edge transport server When we are renewing the Certificates with wildcard certificate on both mailbox server ,and on edge transport server ,it is impossible for me to renew the edge subscription It says the cerificate is in "doublon" (repetitive) on one of the Exchange servers.I have always been using same certificate on exchange server be it edge or mailbox I tested a bogus different certificate on mailbox and on edge,only then th e edge sync works Did anybody come across this issue. Thanks
