What Our Deliverability Numbers Mean (and What They Don't)
WarmySender shows two different kinds of deliverability information, and they answer two different questions. It is easy to read one as the other, so here is exactly what each one measures.
What the Deliverability tab measures:
The Inbox Rate Trend and Mailbox Health Matrix under Analytics > Deliverability are built entirely from warmup mail — the messages your mailboxes exchange with other verified mailboxes in the warmup network. Each day we check the receiving mailbox to see whether a warmup email arrived in the inbox or in the spam folder, and that becomes your inbox rate, spam rate and health score.
So those figures describe your sending account's reputation over time. A rising inbox rate means providers are treating mail from that mailbox more favourably. It is the number to watch before and while you run a campaign, and it is exactly what warmup exists to improve.
What those numbers do not tell you:
They do not tell you where a campaign email landed. A campaign email travels from your mailbox to a real prospect's mailbox, which we have no access to. Once the recipient's mail server accepts the message, whatever happens next — inbox, spam folder, or a category tab — happens inside an account we cannot see. That is a property of email itself, not a gap in your reporting.
One honest caveat about tabs: mail providers do not reveal which tab a message was filed under, so when a warmup email is sorted into Promotions or Updates we count it as inbox. Read 'inbox' as 'not in the spam folder' rather than 'in the Primary tab'.
What you can see for a campaign:
- Bounce Rate and Delivery rejection rate, on the campaign's own page.
- The reasons behind those rejections, grouped in plain language. They include 'Recipient mail server rejected as spam' and 'Your sending provider rejected the message as spam before it left your mailbox', alongside a missing address or an unreachable mail server. This is real spam feedback — it covers mail that was refused outright at the moment of sending, which we do see.
- Automatic protection. If every send in a campaign is being refused on content or policy grounds, WarmySender pauses the campaign so your prospect list is not used up, links you to how to fix it, and lets you restore the affected prospects once you have rewritten the message. Resuming is your call, not automatic.
- Opens, clicks and replies, which remain the most practical evidence that your mail is being read.
Why the two cannot be merged:
Warmup mail lands in mailboxes we can check, so we can report its folder. Campaign mail lands in mailboxes only your prospect can see. The first is a reputation gauge you can watch daily; the second is only visible to us up to the moment it is accepted or refused.
A note on placement testing:
A separate class of tool estimates placement by mailing a panel of its own test addresses and reporting which folder each copy reached. WarmySender does not do that — there is no test panel and no test send — and such tools sit alongside warmup rather than replacing it. If you use one, read its result next to your warmup inbox rate: one estimates where a sample message lands, the other builds the reputation that decides where your real mail lands.