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I've been able to update the Exchange safelist based on the user mailbox safelist with:

get-mailbox | where {$_.RecipientType -eq [Microsoft.Exchange.Data.Directory.Recipient.RecipientType]::UserMailbox } | update-safelist

But is there a way to actually view the safelist?

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up vote 0 down vote accepted

As per this article this should not be possible. The aggregated addresses are one-way hashed and then converted to binary for security purposes.

You can only hash given email with SHA-256 and then compare it to the values in the user's objects attribute msExchSafeSenderHash to see if it is the same, but that's about it.

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