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Creating Visual Indicators for spoofed / external emails with PowerShell

I've been managing mail service for users for a lot of years now. I don't do it daily but I've spent my fair share of time analyzing spam emails. Mail vendors are doing what they can fighting spam, but it's not easy. Each month, each year spam is getting more sophisticated. Spam emails either look like a legit email, or worse someone is targeting your company trying to get them to transfer money into a wrong account. While most of those end up in spam, there are those that come thru. It's even worse if the company you work with has not implemented SPF or their SPF is configured to soft fail which can't be treated as spam.

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Bittitan MigrationWiz – The selected Mailboxes cannot be subscribed

Recently I'm doing yet another migration between Office 365 tenants using Bittitan Migration Wizard. It's a great tool and takes away a lot of headaches when dealing with the migration of mailboxes or OneDrive data. Unfortunately, like with many blogs on my website I had to hit yet another error. This time error occurred when I tried to assign User Migration Bundle license to users on the Migration Wizard.

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Microsoft Exchange – 420 4.2.0 Recipient deferred because there is no Mdb

Last few weeks I'm responsible for migrating from Office 365 to Office 365. Part of this migration process is to set up new Exchange 2016 server that will work as relay instead of using IIS server. I've setup hybrid, added accepted domains, prepared connectors, but there's one thing missing. Any time an email is sent via relay to a user that exists on Office 365 and at the same time exists in Active Directory email never gets there.

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