Fwdsky email glossary

Email terms, explained.

New to temporary email and email forwarding? Learn what each address does before deciding where your next message should go.

What is email forwarding?

Email forwarding sends messages addressed to one email address to another. With Fwdsky, an active forwarding alias receives the message, and your login email is where it ultimately arrives.

See where an email goes

What is an email alias?

An extra address that receives mail on your behalf. Create separate aliases for subscriptions and shopping without managing a separate inbox for each one.

Understand aliases and destination inboxes

01 / ADDRESS TYPES

First, know what each address does.

Email addresses may look alike, but where they receive mail, how long they last, and what they’re suited for can differ.

Choose an address for your needs

Temporary email

Definition: An email address that works for a limited time and is suited to short-term messages. Fwdsky temporary email requires no account login. New addresses are valid for 3 hours by default, and messages can be read in the web inbox.
Example: When testing an app’s welcome email, copy the address generated on the homepage into the form, then return to the inbox to check for the message.
Don’t confuse it with: Temporary email is not a long-term backup address. Don’t use an expiring address for accounts you may need to recover, billing messages, or customer support.

Disposable email

Definition: A term for an email address used for a specific task and then discarded. It often refers to the same kind of service as temporary email.
Example: Use an address to receive a confirmation email for a one-time download, save what you need, and avoid giving that address to other websites.
Don’t confuse it with: “Disposable” doesn’t mean it can receive only one message. Whether it can receive more depends on whether the address is still active and whether the sender accepts it.

10-minute mail

10 minute mail

Definition: A common search term for short-lived email. It can also refer to services that actually provide a 10-minute address. The rules vary by service.
Example: If you find Fwdsky by searching for “10-minute mail,” check the actual countdown on the homepage: new addresses here are valid for 3 hours by default.
Don’t confuse it with: The name doesn’t promise a specific duration. Searching for this term doesn’t mean your address has only 10 minutes left or that every refresh resets the timer.

Email alias

Definition: An additional email address linked to a destination inbox. Fwdsky forwarding aliases are for ongoing use. Log in to create, deactivate, or delete them in the dashboard.
Example: Give readingnotes@fwdsky.com to a subscription website, and messages can be forwarded to your login email. This address is for illustration only; create it before using it.
Don’t confuse it with: An alias isn’t a separate login account or a guarantee of anonymity. Your destination inbox, website account, and message contents may still be linked to your identity.

Destination inbox

Definition: The inbox that ultimately receives forwarded messages. On Fwdsky, this is the real email address you use to receive a login code and sign in.
Example: Log in with your everyday email and create a shopping alias. Enter only the alias on the shopping website, then read forwarded order updates in your everyday inbox.
Don’t confuse it with: A destination inbox isn’t the temporary web inbox. Deactivating an alias won’t delete copies of messages already delivered to your destination inbox.

02 / EMAIL FLOW

Next, see where messages go.

Know where a message comes from, which address it’s sent to, and where you ultimately read it.

Open the temporary inbox

Email forwarding

Definition: Receiving messages sent to one address and delivering them to another. On Fwdsky, an active alias handles the middle step.
Example: A subscription service sends its newsletter to your alias, and Fwdsky forwards it to your login email. Whether it arrives depends on email processing and whether the destination inbox accepts it.
Don’t confuse it with: Forwarding is for receiving messages; it doesn’t mean you can send or reply from the alias. Fwdsky’s temporary inbox isn’t a sending tool either.

From Subscription service

Received at Forwarding alias

Delivered to Login email

Sender

Sender / From

Definition: The sender shown in an email’s headers, usually including a display name and an email address. Check both when reviewing a message.
Example: An email displays “Account Security Team.” Check the actual sender address and context, and whether you recently tried to sign in.
Don’t confuse it with: A familiar name or logo doesn’t prove a message is trustworthy. Sender details can be spoofed, so don’t click links or share verification codes based on appearance alone.

Recipient

Recipient / To

Definition: The person or address a message is sent to. The email address you enter in a website form is usually the recipient address for that message.
Example: If you enter a forwarding alias when signing up, the website sends the message to that alias first. Reading it in your destination inbox doesn’t mean the website knew that address from the start.
Don’t confuse it with: The To field shown in an email doesn’t always match its actual delivery path. Mailing lists, BCC, and forwarding can make them differ.

Inbox

Definition: The place where you view a list of received messages and their contents. The Fwdsky homepage inbox shows messages sent to a temporary address, not your account’s forwarding archive.
Example: After submitting a temporary address, wait for the message to appear in the homepage list. Select it to view the subject, sender, and message.
Don’t confuse it with: Microsoft and Uber emails shown in an empty inbox are demo content for display purposes. They don’t mean those services actually sent you a message.

Delivery failure

Definition: A message that fails to reach its destination at some point in the delivery process. Possible causes include an incorrect address, recipient restrictions, or rejection by the destination service.
Example: Check the address spelling and expiry first, then confirm the alias is active and the destination inbox is working. If an archive record is available, use its status to help identify the issue.
Don’t confuse it with: “I haven’t received it yet” doesn’t necessarily mean delivery failed; the message may be delayed. Refreshing checks the list again but can’t make the sender resend it.

03 / TIME AND SECURITY

Finally, check timing and access.

Addresses expire, inboxes have access controls, and different codes prove different things. Each has its limits.

Plan how long you need the address

Expiry

Mailbox lifetime / Expiry

Definition: How long a temporary inbox remains usable. The homepage countdown shows the actual time until expiry, not how long you’ve had the page open.
Example: If your address has 20 minutes left but you expect a confirmation email in an hour, extend it before it expires and make sure the action succeeds.
Don’t confuse it with: An inbox’s lifetime is different from the expiry of a verification code in an email. An active address doesn’t mean an old code is still valid.

Extend time

Extension

Definition: Adding more time to the current temporary inbox. On Fwdsky, successfully selecting “Extend by 3 hours” adds 3 hours to the current inbox.
Example: If about 20 minutes remain, a successful extension brings that to about 3 hours and 20 minutes. Check the updated countdown for the exact time left.
Don’t confuse it with: Extending doesn’t change the address or happen automatically when you refresh. It can’t restore an expired inbox or deleted messages.

Mailbox token

Definition: Authorization data your browser uses to access a specific temporary inbox. Unlike the email address, which you can share publicly, a mailbox token should be guarded like a key.
Example: When you return to the homepage in the same browser, a saved token can restore access to an inbox that’s still active. Clearing browser storage may make it impossible to regain access.
Don’t confuse it with: An email address isn’t an access credential. Never share a mailbox token, a screenshot of browser storage, or a request containing the token—including with support staff.

Verification code

Email verification code

Definition: A short code sent by a service to confirm you can access an email address. To sign in to Fwdsky, enter the 6-digit code sent to your real email address.
Example: Request a code on the login page, retrieve it from your inbox, then enter it on the same login page. Enter codes for other websites on their respective sites.
Don’t confuse it with: An email verification code isn’t a mailbox token or a time-based code from an authenticator app. The demo email’s 684172 cannot be used to sign in to a real account.

Two-factor authentication

Two-factor authentication / 2FA / TOTP

Definition: An additional identity check using a time-based code from an authenticator app, on top of an email verification code. Once enabled, you’ll need to complete this step to sign in to Fwdsky.
Example: Start setup in the dashboard. Scan the QR code with Google Authenticator, Microsoft Authenticator, or the 1Password mobile app, then enter the 6-digit code shown in the app to confirm activation.
Don’t confuse it with: Authenticator codes change over time and aren’t sent by email. QR codes and setup keys are sensitive too. Two-factor authentication can’t protect you if you give a code to a phishing site.

Four common mix-ups

Similar at a glance, different in practice.

Button labels matter. Before you act, check whether the action changes the message list, the expiry time, the address, or access permissions.

Refresh ≠ extend

Refreshing checks for new messages; extending adds time to the current inbox. The countdown keeps running after a successful refresh—it doesn’t reset.

Estimate how long you’ll need

Deactivate ≠ delete

Deactivating an alias discards new incoming messages, and you can reactivate it later if needed. Deleting removes the alias, and you shouldn’t assume it can be restored. Neither action recalls copies already delivered to your destination inbox.

Manage forwarding aliases

Forwarding ≠ sending

Forwarding delivers incoming messages to your destination inbox; it doesn’t let you send messages from the alias. To send or reply, use your own email service and check which address appears in your reply.

Review the forwarding path

Alias ≠ anonymity

An alias reduces exposure of your real email address, but doesn’t erase website login records, billing details, or personal information in messages. Take care when choosing recipients and deciding where to use an alias for sensitive information.

Understand privacy limits

Now that you know the terms, choose an address.

Use temporary email for a verification code you need now; choose a long-term forwarding alias for messages you’ll need to keep receiving.

Use temporary email Set up email forwarding

Still deciding? Compare the use cases for both address types

Still have a term you’d like us to explain? Email support@fwdsky.com. Tell us what concept you’re asking about. Don’t send verification codes, keys, or mailbox credentials.