Open Gmail Settings
In Gmail, click the gear icon (⚙) in the top right, then click See all settings.
Gmail Setup
Send from your domain addresses in Gmail.
OhRelay already forwards incoming emails to your Gmail. This guide covers the outgoing side — adding your OhRelay sending gateway to Gmail so you can reply using your domain address.
You only need to do this once per working inbox. All your domain addresses on that inbox will work through the same gateway.
How it works
What the gateway email does
When you set up OhRelay's SMTP gateway on a working inbox, OhRelay gives you a special Gateway Email. This is the sender identity you'll add to Gmail.
When a customer emails support@yourdomain.com, it arrives in your Gmail. When you reply, you select the gateway address as the sender. OhRelay receives the message, figures out the original context, and delivers it with support@yourdomain.com as the From address. Your customer sees your domain address — not the gateway address.
Step-by-step
Adding the gateway to Gmail
Go to "Accounts and Import"
Click the Accounts and Import tab. Find the Send mail as section, and click Add another email address.
Enter the gateway details
A small window opens. Fill it in like this:
- Name: Your name or your business name
- Email address: The Gateway Email shown in your OhRelay dashboard
⚠ Important: Do not check the "Treat as an alias" option. Leave it unchecked. Then click Next Step.
Enter the SMTP server settings
Fill in the following fields:
- SMTP Server:
smtp.ohrelay.com - Port:
587(TLS/STARTTLS) - Username: the Username from your OhRelay dashboard
- Password: the Password from your OhRelay dashboard
- Connection: TLS (not SSL)
Click Add Account.
Verify the address
Gmail will send a verification code to the gateway email. OhRelay intercepts it — go back to your OhRelay dashboard, open the working inbox's SMTP Credentials section, and look for the verification code displayed there. Enter that code in Gmail's confirmation window.
You're ready — here's how to use it
When composing a new email or replying, click the From field in Gmail and select your Gateway Email from the dropdown. That's the one step you do each time.
OhRelay uses the gateway as the authenticated sender and restores the visible domain address on delivery based on the thread context.
✅ Good news: You only configure this once, and the same gateway works for all your domain addresses on that inbox — no matter how many you have.
Day-to-day use
Sending is a one-click action
Replying to a forwarded email
Open the email and click Reply. Click the From field and select your Gateway Email from the dropdown. Hit send — OhRelay delivers the reply with the correct domain address on the other end.
Composing a new email
Click Compose. In the From field, select the gateway address from the dropdown. Write your message and send. The recipient sees the correct domain address, not the gateway.
Why manual selection?
Email standards (DMARC/SPF) and platform policies require the sender to explicitly choose which identity to send from. OhRelay doesn't override this automatically — but you only have one gateway to remember, regardless of how many domain addresses you have.
Multiple domains?
One gateway covers all your addresses
You only add the gateway once per working inbox. All domain addresses that route to that inbox (whether you have 1 or 50 of them) work through the same gateway. If you add new domain addresses later, they automatically work — no Gmail changes needed.
Prefer a desktop client?
Using Apple Mail or another app?
Desktop clients like Apple Mail, Spark, or Thunderbird work with OhRelay's SMTP gateway too — same one-click From selection, same single gateway address.