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Yes. Open the message that SimpleLogin forwarded to your mailbox and select Reply. SimpleLogin uses a special reply-to address (often called a reverse alias) to route your response to the original sender while placing your SimpleLogin alias in the outgoing From field. Your personal mailbox address is intended to remain hidden. Sending from an alias, including replying, is documented as a paid-plan feature, so confirm your current eligibility in SimpleLogin’s plan documentation.
What happens when you reply
A SimpleLogin alias is an address that accepts mail and forwards it to one or more mailboxes you have configured. The forwarding message contains routing information that your mail app normally handles for you. The important part is a special Reply-To destination rather than the original sender’s ordinary email address.
- A contact sends a message to your SimpleLogin alias.
- SimpleLogin forwards that message to an associated mailbox and inserts a service-managed reply-to address.
- You click Reply in your normal mail app. The app addresses the response to that reply-to address.
- SimpleLogin recognizes the address as a reverse alias, maps it to the original contact, and delivers the message onward.
- The outgoing message uses your SimpleLogin alias in the From field, so the contact does not receive your underlying mailbox address.
The reverse alias is an intermediate routing address. It lets SimpleLogin connect a particular conversation or contact with your alias without exposing the mailbox where you read the forwarded message. You do not normally need to copy, edit, or understand this address; using the mail client’s ordinary Reply command is the intended workflow.
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What you need before replying
| Requirement | Why it matters |
|---|---|
| An active SimpleLogin alias | The alias must still accept mail and be connected to a destination mailbox. |
| A mailbox that receives the forward | You need to be able to open the forwarded message and send mail from that mailbox. |
| Alias-sending eligibility | SimpleLogin documents sending from an alias, including replies, as a paid-plan capability. SimpleLogin Premium and Proton Pass Plus are examples named in its documentation; plan names and eligibility can change. |
| Direct delivery to the mailbox | Additional forwarding or alias layers can alter headers and interfere with the reply route. |
SimpleLogin’s mailbox documentation allows an alias to be associated with one or more mailboxes. Owners of those associated mailboxes can read forwarded messages and use them to reply. If several people receive the same alias mail, make sure each person understands which mailbox and account they are using when sending a response.
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How to reply from your mailbox
The exact buttons differ between webmail and mobile apps, but the process is the same.
- Open the destination mailbox. Use the mailbox configured for the alias, not an unrelated account that merely received a copied message.
- Open the forwarded message. Confirm that the message was delivered through the expected SimpleLogin alias.
- Select Reply. Use the standard Reply action rather than starting a new message to the contact’s visible address.
- Leave the service-managed recipients and sender fields intact. Your client should use the special reply-to address and the alias-sending route. Do not replace the recipient with the contact’s direct address if privacy is important.
- Write your response and send it. SimpleLogin receives the message, maps the reverse alias to the original contact, and relays it.
- Check the result in Sent, if needed. The recipient-facing sender should be your SimpleLogin alias, not the personal address of the mailbox that handled the forward.
Replying to the forwarded message is preferable to manually composing a new message because it preserves the routing information SimpleLogin added. If you copy only the visible sender address into a new message, you may bypass the reverse-alias mechanism.
Replying versus starting a new conversation
There are two different jobs:
- Replying to an existing message: open the forwarded message and use Reply. The reply-to information already associates the response with the original contact.
- Starting a message to someone you have not contacted through the alias: create a reverse alias for that contact first, then send to the reverse alias.
This distinction matters because an ordinary alias address is designed to receive mail. It is not, by itself, a universal outgoing address for arbitrary recipients. The reverse alias gives SimpleLogin a destination and a relationship it can route safely.
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How to send to a new contact
SimpleLogin’s Contacts controls provide the documented way to create a reverse alias for a new contact. The feature is listed as available only on a paid plan.
- Open the SimpleLogin dashboard and go to the Contacts controls for the relevant alias.
- Create a reverse alias for the person or address you want to contact.
- Copy the generated reverse-alias address.
- Compose a new message in your normal mailbox and address it to that reverse alias, not directly to the person’s real address.
- Send the message. SimpleLogin uses the reverse alias to deliver it while presenting your SimpleLogin alias as the sender.
Once a contact has a reverse alias, future exchanges should use that address as the routing endpoint. Keep the generated address with the contact record rather than replacing it with the person’s direct address in your mail client.
What the recipient sees
The recipient-facing message is intended to show your SimpleLogin alias in the From field. SimpleLogin’s documentation specifically says that your personal email address stays hidden when you send from an alias. The recipient can therefore reply to the alias-based conversation without learning the mailbox address behind it.
The mailbox itself still matters operationally: it is where you read the forward and where your mail app submits the reply. That internal mailbox address should not be confused with the sender identity that SimpleLogin presents to the contact.
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Privacy can be defeated by your own message content. Do not add your personal address to a signature, quote an earlier message that contains it, or manually alter the sender and recipient fields if keeping the address private is a requirement.
Why extra forwarding can break replies
SimpleLogin advises against using another forwarding or alias service as the mailbox destination. Every additional hop can rewrite headers, replace the reply-to value, or otherwise prevent SimpleLogin from recognizing the reverse-alias route. In that situation, the message may still arrive, but Reply may address the wrong place or fail to send through the alias.
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Automatically forwarding an older mailbox into a SimpleLogin alias can create a similar problem. Header rewriting in the older mailbox may remove or change the information SimpleLogin needs. The most reliable arrangement is:
- contact sends to the SimpleLogin alias;
- SimpleLogin forwards directly to your ordinary mailbox;
- you reply from the forwarded message without inserting another forwarding service in between.
Troubleshooting a reply that does not work
The compose window shows your personal address
- Stop before sending if exposing that address would be a problem.
- Make sure you opened the message in the mailbox directly associated with the alias.
- Confirm that your account has the paid-plan capability for sending from an alias.
- Check whether another forwarding step changed the message headers.
- Reopen the original forwarded message and use its Reply action instead of a new compose window.
The message goes to the wrong recipient or bounces
- Verify that you did not replace the service-managed reply-to recipient with a direct address.
- Check that the alias is still active and that the message was actually forwarded by SimpleLogin.
- Remove intermediate forwarding or alias services and have the alias deliver directly to the mailbox.
- If the problem concerns a new contact, create or regenerate the contact’s reverse alias through the Contacts controls and send to that address.
You cannot find a reverse alias for a new contact
Look in the Contacts controls for the specific alias. Creating a reverse alias is a separate step from merely owning an incoming alias, and the sending feature requires an eligible paid plan.
A reply worked once but later stopped
Recheck the alias status, the destination mailbox, and your subscription eligibility. Plan features and availability can change, and an alias or mailbox configuration may have been modified since the earlier message.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Paid-plan availability and changing plan names
SimpleLogin’s documentation identifies sending from an alias—including replying to forwarded mail and sending to a new contact through a reverse alias—as a paid-plan feature. It names SimpleLogin Premium and Proton Pass Plus as examples, not as a permanent pricing list. Because plan names, limits, and eligibility may change, consult the current official plan information for your account before subscribing or troubleshooting a missing feature. This article does not state a price because the applicable amount depends on the current offering and billing terms.
Technical details for advanced users
At the message level, the workflow depends on two related addresses: the alias that appears as the sender and the reply-to or reverse-alias address that SimpleLogin uses internally to identify the contact. SimpleLogin’s implementation documentation and API references describe contacts with reverse-alias addresses and record alias activity such as replies. Those details explain why the ordinary Reply command works without requiring you to expose the mailbox address or operate an API client.
You generally should not edit these headers manually. Mail software can display them differently, but changing them can remove the routing value that connects the response to the correct contact.
Best-practice checklist
- Use Reply on the forwarded message for an existing conversation.
- For a new conversation, create a reverse alias in the alias’s Contacts controls and send to that address.
- Keep the alias-to-mailbox path direct.
- Avoid forwarding an older mailbox into the alias when header rewriting could occur.
- Check the From field before sending if hiding your personal address is essential.
- Do not put your personal address in the signature or message body.
- Confirm current paid-plan eligibility because sending-from-alias availability can change.
With that setup, replying feels like normal email: you work in your usual mailbox, while SimpleLogin handles the reverse-alias routing and presents the alias to the person you are contacting.
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