Office 365

After migrating from Gmail to O365 hosted Exchange, outside domains are receiving undeliverable bounce back messages stating Unroutable address.    Remote Server returned '550 Unroutable address'
Is there a way to correct this before too many emails are lost?
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teksolgregAsked:
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teksolgregConnect With a Mentor Author Commented:
DNS was the problem
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Scott Fell, EE MVEDeveloper & EE ModeratorCommented:
Are you sure the email accounts are set up correctly?

Did you check that all dns info is pointing to the correct place? http://mxtoolbox.com/

How long has it been since you made the switch?
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teksolgregAuthor Commented:
Here is what was done and checked:
- Migrated from Google to O365 with migration tool
- Added all domains to O365 Admin portal
- Email accounts, set up and spelled correctly in O365 Admin portal
- Domain verification has been made in the O365 Admin portal

Old info: 123@abc.com
New info: 123@def.com
 - Added record in Exchange properties through O365 Admin portal to reflect 123@abc.com as acceptable SMTP setting

Still receiving Unrouteable address
Remote Server returned '550 Unrouteable address'
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teksolgregAuthor Commented:
I should preface, 123@abc.com is the same user as 123@def.com and 123@abc.com is not set up in the O365 portal.
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Computer GuyCommented:
Sorry to say, Office 365 is garbage! I switched to and from a few times! Not sure if cost is what you're looking at, but I like webhosting.net and also 123together.com.
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teksolgregAuthor Commented:
Customer desire.  Never had any problems until today.
Just figured it out ...  Intermediate hosting company.
Thanks for pitching in
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teksolgregAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for teksolgreg's comment #a39598855
Assisted answer: 100 points for padas's comment #a39598772

for the following reason:

DNS was the culprit on this one.  Previous provider did not remove their DNS mail records.
The mxtoolbox is a great tool, thanks as this should be a go to tool for anyone troubleshooting mail flow.
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Scott Fell, EE MVEDeveloper & EE ModeratorCommented:
This might be it
Old info: 123@abc.com
New info: 123@def.com

Did you set abc.com as a domain alias?
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teksolgregAuthor Commented:
DNS reports illustrated solution
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