Urgent - some emails still going to old mailbox after migration to Office365

Hi All,

We previously had email accounts hosted at Microsoft Live platform for one of our domains say abc.com. Which I have migrated to Office 365 Small Business accounts. Name server changes took place nearly 10 hours ago and I have also migrated old emails using PST files. Many test emails from Gmail account landed in the Office365 portal fine which tells me that mail started flowing to the Office365 (Exchange Online mailboxes).

We have a major issue with some emails still going to the old mailboxes hosted at Microsoft Live platform. Specially from our in-house exchange server. None of the emails from this exchange server land in Office 365. Now that we don't have any control of the DNS records and the MX records correctly pointing to Office365 what is still wrong??

Could there be a DNS entry or similar on our Exchange which I need to change/edit?

This is an urgent issue and needs to be resolved quickly.

Thanks for your help!
Abid
Abid MuhammadIT ManagerAsked:
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Abid MuhammadConnect With a Mentor IT ManagerAuthor Commented:
Hi Rancy and xKincaidx,

Many thanks for your kind attention. I had raised the ticket with T-Suite helpdesk (Microsoft has delegated the Office 365 services/support to Telstra in Australia) and they immediately fixed the issue.

I still don't know what they did to make it work. However thanks for the input.

Will close the ticket now.

regards,
Abid
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Skyler KincaidConnect With a Mentor Network/Systems EngineerCommented:
DNS can take up to 48 hours to propagate. Did you have an A record for your old email that pointed it to Live? If you did you need to change it on your internal server.
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Abid MuhammadIT ManagerAuthor Commented:
I didn't set up any A records on our internal Exchange server.

I wonder why Gmail and Hotmail accounts are sending emails perfectly fine to the Office365 mailbox from last 9 hours whereas our Exchange server still cannot route emails to the new platform.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Let me help understand few things here :)

1. What is the email address your trying to send emails to ?
2. Is that email also assigned to the mailbox internally ?
3. When you say emails arent going to Office365 is there some forwarding on internal mailboxes or how was the plan set to send emails to O365 users from internal accounts ?

- Rancy
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Abid MuhammadIT ManagerAuthor Commented:
I had raised the ticket with T-Suite helpdesk (Microsoft has delegated the Office 365 services/support to Telstra in Australia) and they immediately fixed the problem.
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