Exchange 2013 OWA: Always download remote content from domain/sender

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We are using Exchange 2013 for multi-tenant email hosting and I am trying to create a policy that will always show remote content from a specific sender domain (or single sender is fine too) in OWA.

We send out weekly reminders in an HTML email that reference external images and these images are always blocked.

Things I have tried:

  • Manually adding an email address to the safe sender list under "block or allow"
  • Set-MailboxJunkEmailConfiguration to add our email address to the TrustedSendersAndDomains
  • Creating a mail flow rule to bypass spam filtering for our domain
  • Set-ContentFilterConfig -BypassedSenderDomains *.ourdomain.com to bypass content filter for our domain

No matter what OWA still prompts for the remote content to be downloaded with each sign in.

The goal is to have a configuration that would automatically download remote content for ALL exchange users when the sender is a specific email address or domain. Is this possible with Exchange 2013 & OWA?

Here is an image showing what I would like to bypass:

enter image description here

Ideally, a rule or setting can be changed so user@domain.com is exempt from having content blocked in OWA. If not, then a command that could be run periodically or when we add new mailboxes to apply the setting to each mailbox is fine too.

Thanks

Best Answer

My thought was to check OWAMailboxPolicy (get-owamailboxpolicy), but there don't seem to be settings here. There is a bit about MIME types and FRAME and IFRAME allowance, but if you can successfully view external content, I don't think that's the cause.

Just to confirm, you DO see the domain/sender in question when you run:

(Get-MailboxJunkEmailConfiguration -Identity <mailboxid>).TrustedSendersAndDomains

...right?

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