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June 22nd, 2015

Prevent Addressing Mistakes with Domain Fencing

Posted in: Tips, Product

We all have lots of email accounts we use for different things, so it's all too easy to send a message to a different email address than the one you really want, or to send a message from an account you didn't intend to use. It can be embarrassing, or worse, get you into hot water.

Postbox 4 has a brilliant new feature called "Domain Fencing" that keeps you from making these kinds of mistakes. It gives you a gentle warning if you're about to send a message to the wrong address, or if you're about to send from the wrong account.


With Domain Fencing, if you address a message outside a particular domain, or to a domain you've decided is off-limits, the contact's address bubble turns red to indicate that an addressing mistake is about to occur. (You can go ahead and use the address anyway if you like. Just don't say Postbox 4 didn't warn you!)

Best of all, each email account in Postbox 4 has its own Domain Fencing settings, so you can create any address warnings an account may need.

How to Get Started

  1. Go to Preferences/Options > Accounts.
  2. Click the disclosure triangle to the left of an email account's name.
  3. Select the account's Composition settings.
  4. In the Addressing section of the Composition pane, you'll see:
  • Mark addresses not ending with: — Use this setting to make sure messages you send go only to the domain (or domains) that you want to associate with this account.
  • Mark addresses when sending to: — Use this setting to make sure you're not using the account to send messages to the wrong domain or domains.

Some Examples of How Domain Fencing Works

You would want to restrict the domains an account sends to when:

  • You don't want to use your business email address for personal messages.
  • You want to make sure messages you send never leave a particular domain, like the one belonging to your company or organization.
  • You want to use an email address only for corresponding with a specific domain, such as a particular client's.
  • You have multiple addresses for a co-worker and don't want to send a message to their personal account by mistake.

In each of these cases, select Mark addresses not ending with: and enter the name of each domain to which you want to restrict the account.

You would want to make sure you're using the right account when:

  • You don't want to send messages from a personal account to a business address by mistake.
  • You don't want to use the wrong business account for a particular client or project.
  • You want to make sure you never send a message to a particular domain using the account.

Select Mark addresses when sending to: and enter the domains to which you don't ever want to send messages from the account.

So, You Have Two Choices

Either wait for your next addressing embarrassment, or set up Domain Fencing for each of your email accounts to make sure it never happens. Domain Fencing is just one more way Postbox 4 is the killer app for people who are serious about email.