E4ward can route your replies so the recipient sees your alias as the sender — not your real inbox address.
When mail arrives through one of your aliases, E4ward inserts a Reply-To header pointing back to E4ward's servers. When you hit reply and send, your reply goes through E4ward, which replaces your real address with the alias before sending it on to the recipient.
The result: the person you're replying to sees your alias, not your real email.
Just hit reply normally in your mail client. Don't change the To line. E4ward handles the rest automatically.
Each reply address is only valid for a limited time after the original message arrives.
If it's expired, your reply won't go through — you'll get a delivery error back saying the link has expired. From there:
On each forward, you can turn off reply rewriting by checking the "No Rewrite" option. If you do this, replies you send will show your real inbox address to the recipient.
This is sometimes needed if a particular sender's mail service rejects messages with modified headers. E4ward automatically disables header rewriting for certain senders (like eBay and PayPal) to prevent their mail from being flagged as phishing.