Group Won’t Accept Mail From ‘Outside’
Jan10

Group Won’t Accept Mail From ‘Outside’

KB ID 0001771 Problem Exchange has been this way for a long time here’s me explaining this very problem with older versions of Exchange. If you create a ‘Group’, be that a Distribution Group, or a ‘Microsoft 365′ Group, the default setting is to NOT ALLOW mail from anyone outside your organisation. If you attempt to send mail to that group you will see errors like these; Errors; 550 5.7.133...

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No Mail Flow On-Premises To/From Office 365
Dec24

No Mail Flow On-Premises To/From Office 365

KB ID 0001631 Problem I upgraded my On-Premises Hybrid Exchange server recently, from Exchange 2016 to Exchange 2019. I remembered to add the new server onto the Office 365 send connector, but there was no mail flow between an on premises mailbox and an office365 mailbox? Solution This happens because, (even if you are using the same certificate on the new and old servers) the certificate that is used for TLS security between your...

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Office 365 Retention Policies
Nov18

Office 365 Retention Policies

KB ID 0001620 Problem Most things in Office 365 operate on a 30 day retention principle, but what if you are governed by restrictions that require you to retain your data for 5 years or 7 years in some cases? We have had Retention policies in Exchange for years, and I knew you could create a policy in exchange online, but what about OneDrive or SharePoint data? Well with O365 you can specify a ‘top level’ retention policy...

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Exchange Exporting Mailboxes to PST Files
Oct31

Exchange Exporting Mailboxes to PST Files

KB ID 0001360 Problem Applicable To: This procedure works on all versions of Exchange Newer than Exchange 2010 SP1 (update rollup 8). If your Exchange server is OLDER than that you will need to use the following link; Exchange 2007 / 2010 (Pre SP1)- Export Mailbox’s to PST files The following procedure exports a user mailbox to a PST file on a network share. Solution Note: Not Even ‘Exchange Organisation Administrators”...

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Hybrid Exchange: ‘Mailbox Delegation’ Missing?
Oct11

Hybrid Exchange: ‘Mailbox Delegation’ Missing?

KB ID 0001607 Problem This was asked on EE this morning, if you are on a Hybrid Exchange environment then you cannot allocate Mailbox Delegation to an Office365 mailbox; However you can add ‘Mailbox Delegation’ to a ‘local mailbox’. This is completely normal behaviour, to allocate mailbox delegation permissions to your Office 365 mailboxes, you need to use PowerShell. Managing Mailbox Delegation Permissions in...

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Exchange: ‘Can’t find the Organizational Unit that you specified’
May30

Exchange: ‘Can’t find the Organizational Unit that you specified’

KB ID 0001561 Problem I’ve not actually seen this myself, but it was asked on a forum, and I managed to replicate it on the bench. When working on a user or mailbox in Exchange  you may see the following error; Error Can’t find the organisational unit that you specified, Make sure that you have typed the OU’s identity correctly Solution This happens because you have a ‘Slash’ ‘/’in the...

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