Setting Mailbox Database Limits with PowerShell
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First you might want to record the current settings. I would run this Command to view the current settings:
*in each of these examples change SERVERNAME to the name of your server.
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Get-MailboxDatabase -Server SERVERNAME | FL name,issuewarningquota,prohibitsendquota,prohibitsendrecievequota

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To set the Issue Warning Quota:
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Get-MailboxDatabase -Server SERVERNAME | Set-MailboxDatabase -IssueWarningQuota unlimited

 
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To Set the Prohibit Send Quota:
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Get-MailboxDatabase -Server SERVERNAME | Set-MailboxDatabase -ProhibitSendQuota unlimited

 
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To Set the Prohibit Send / Receive Quota:
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Get-MailboxDatabase -Server SERVERNAME | Set-MailboxDatabase -ProhibitSendReceiveQuota unlimited

 
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IF you want to set all at the same time:
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Get-MailboxDatabase -Server SERVERNAME | Set-MailboxDatabase -IssueWarningQuota unlimited  -ProhibitSendReceiveQuota unlimited -ProhibitSendQuota unlimited

