Email forwarding and temporary email are often mentioned in the same breath, but they work very differently and solve different problems.
How email forwarding works
A forwarding rule tells a mail server: "when mail arrives at address-A, re-deliver it to address-B." The mail arrives at address-B — your real inbox — just as if it had been sent there directly. The forwarding address persists as long as the rule is active, which is typically indefinite.
How temporary email works
A temporary address is a live inbox with a countdown. Mail is delivered, stored briefly, and deleted when the inbox expires. Nothing is forwarded anywhere. The address, and everything in it, ceases to exist when the timer runs out.
Side-by-side comparison
| Factor | Temporary email | Email forwarding |
|---|---|---|
| Mail goes to | Browser inbox (expires) | Your permanent inbox |
| Lifespan | Minutes to hours | Indefinite |
| Setup | None — instant | DNS/hosting config, or alias service |
| Reveals real address | No | No (to sender) |
| Protects inbox from spam | Yes — expires cleanly | Partially — disable rule to stop |
| Useful after first message | No | Yes |
When to use temporary email over forwarding
When you want exactly zero long-term relationship with the sender. A verification code, a one-time download, a trial you will not continue — none of these need mail to reach your real inbox. Temporary email is faster to set up and cleaner: when the inbox expires, the connection is severed with no rule to remember or disable.
When to use forwarding over temporary email
When you need to keep receiving mail from this sender but want the address to be different from your primary. Forwarding gives you a persistent alternative address that flows into the inbox you already manage, with the option to disable it if the sender starts abusing it.
A note on forwarding and spam filtering
Server-side forwarding can break SPF authentication because the forwarding server is not listed in the original sender's SPF record. This sometimes causes forwarded mail to land in spam at the destination. Alias services often use SRS (Sender Rewriting Scheme) or other mitigations to reduce this problem.