Preparing Your Environment

delivr.to is built to test anti-malware controls, rather than reputation-based controls. To that end, we recommend that you allowlist the following domain in such a way that reputation-based checks are bypassed, for example anti-spam, but anti-malware controls are still applied.

The address to allowlist is no-reply@delivrto.me, and all emails are sent from 159.183.218.214 and 159.183.115.191.

Additionally, emails from delivr.to to validate new mailboxes originate from no-reply@mail.delivr.to. It’s recommended that you add this email address to your allowlists too to prevent any delays in getting setup.

O365

• From your Microsoft 365 Defender portal, under Policies & Rules, navigate to Threat Policies and select Anti-spam. Direct link.
• Select the Anti-spam inbound policy (Default) policy and then scroll to the bottom and click Edit allowed and blocked senders and domains
• Under Senders, click Manage 0 sender(s) and then Add senders
• Enter no-reply@delivrto.me
• Click Add senders and Done
• You should have something that looks like this. Once you’re happy, click Save

If emails are still being blocked, contact Support or join us in #support on Slack to get help.

Mimecast

• Log in to your Mimecast Administration Console.
• Click the Administration toolbar button.
• Select the Gateway | Policies menu item.
• Select Permitted Senders from the list of policies displayed.
• Select the New Policy button.
• Select the appropriate policy settings under the Options, Emails From, Emails To, and Validity sections.
• In the Source IP Ranges field , enter 159.183.218.214
• Save the policy