In Your store → Sending settings, the Senders section shows which addresses your emails and SMS are sent from. If your account uses dedicated sending subdomains, you'll also see the warm-up status for two separate subdomains, one per type of email:
Sender | Subdomain | Used for |
Newsletter Email Sender | e.g. newsletter.yourstore.com | Newsletters and marketing campaigns |
Automation Email Sender | e.g. messages.yourstore.com | Automation scenarios (abandoned cart, welcome emails, recommendations and more) |
Each subdomain builds its own sender reputation and warms up on its own schedule. One can be fully warmed while the other is still warming up.
What is domain warm-up?
Domain warm-up means gradually increasing how many emails a new domain or subdomain sends. Mailbox providers like Gmail and Outlook don't trust unknown senders, so a sudden high volume from a new subdomain can land in spam or get blocked.
edrone starts each subdomain with a lower daily limit and raises it step by step. Providers see steady traffic and good engagement from your recipients, and the subdomain builds a positive reputation. It works the same way as IP warming, but for the sender domain.
Remember: subdomain warm-up is fully automatic. You don't need to set anything up.
Backup address
Under each sender field you'll see a Backup address. This is your main domain address (e.g. marketing@yourstore.com).
When your daily sending volume goes over a subdomain's current limit, the extra emails are sent from the backup address. No email is lost or delayed. The two subdomains can share the same backup address.
What each panel shows
Below each sender (newsletter on the left, automation on the right) there's a panel with the same elements.
Subdomain status
A gauge with a label showing where the subdomain is in the warm-up process. Fully warmed (green) means the subdomain can handle all your traffic for that type of email.
Sending split against the recent peak
A one-line summary, for example: "The subdomain is fully warmed. Its daily limit covers the recent sending peak with additional buffer." Below it are three numbers:
Metric | What it means |
Highest daily send volume in the last 30 days | How many emails of this type you sent on your busiest day in the past month. The limit is compared against this number. |
Subdomain limit compared with the recent peak | The subdomain's daily limit as a percentage of that peak. 100% or more means the subdomain can handle your entire peak day on its own. |
Share of the recent peak that needs the backup address | The percentage of your peak-day emails that would be sent from the backup address at the current limit. 0% means everything goes through the subdomain. |
Example: both subdomains fully warmed
| Newsletter subdomain | Automation subdomain |
Subdomain status | Fully warmed | Fully warmed |
Highest daily send volume in the last 30 days | 389,542 | 6,145 |
Subdomain limit compared with the recent peak | 203% | 139% |
Share of the recent peak that needs the backup address | 0% | 0% |
What this tells you:
Newsletters: the busiest day was about 390,000 emails. The newsletter subdomain's limit is roughly twice that, so even your biggest campaign goes fully through the subdomain.
Automations: the busiest day was about 6,100 emails. The automation subdomain's limit covers that with about 39% to spare.
Backup address: at 0% on both sides, the backup address isn't needed at all.
📌 Tip: if a subdomain showed, say, 60% for Subdomain limit compared with the recent peak, about 40% of your peak-day emails would go out from the backup address. That's normal during warm-up, and the share drops as the limit grows.
⚠️ Important: newsletter volume is usually much higher and more "spiky" than automation volume. Before a much larger campaign than usual, check the newsletter panel. If coverage is close to 100%, part of the send may go out from the backup address.
FAQ
Why are there two subdomains instead of one?
Newsletters and automations have very different volumes and engagement. Keeping them separate means a large campaign can't hurt the deliverability of your automated emails. Learn more in Splitting Transactional and Marketing Domains.
Why do the two panels show different numbers?
Each subdomain has its own limit and is compared against its own peak. Newsletter peaks come from campaigns, and automation peaks come from scenario traffic.
Do I need to do anything if some emails go through the backup address?
No. This is expected during warm-up. Limits grow automatically, and nothing is lost.
How long does warm-up take?
It depends on your volume and how engaged your recipients are. Regular sending and good open rates speed it up.
What if I only see a subdomain on one sender?
Subdomains are set up separately for each stream. If DNS records were added for only one of them, the other keeps sending from your main domain. See the Dedicated Sending Subdomains FAQ.
Need more help?
If you need more help, message us in the chat 💬 or by email at hello@edrone.me