Send-Time Randomisation

What Is Send-Time Randomisation?

Send-time randomisation adds a random delay to your outgoing emails. When you click "Send", the email isn't dispatched immediately — it's queued and sent after a random interval that you configure (1 to 15 minutes).

Why Use It?

State-level adversaries and sophisticated attackers can use timing attacks to correlate identities. If they're monitoring a network and see you press "Send" at 14:23:07, and an email from an anonymous address leaves a mail server at 14:23:08, they can link the two. Send-time randomisation breaks this correlation by adding unpredictable delay.

This is particularly important for:

• Journalists communicating with sources.
• Activists in countries with pervasive surveillance.
• Whistleblowers who need to protect their identity.
• Anyone using PrMail over a VPN in a restrictive country.

How to Enable It

1. Go to Settings in the PrMail sidebar.
2. Find the Send-Time Randomisation section.
3. Tick Enable randomised send delay.
4. Select the maximum delay (1 to 15 minutes). The actual delay is random between 1 minute and your maximum.
5. Click Save.

Things to Know

• A copy of your email is saved to the Sent folder immediately — you don't have to wait for the delay.
• Emails with attachments bypass the delay and are sent immediately (queuing large files is impractical).
• The delay is processed automatically — your browser doesn't need to stay open.
• You can disable send-time randomisation at any time without affecting emails already queued.