How to see emails that didn't get delivered

Short answer: open your Inbox, and on the Campaigns tab look in the left sidebar for Delivery Issues. It's a compact list of every recipient whose email didn't make it — one row each, with the recipient's email, which campaign it came from, which mailbox it was sent from, a plain-language status, a short reason, and the date. If that view is empty, that's the best possible news: it means all your sends are landing.

WarmySender is a 4-pillar outreach platform — Cold Emailing, Email Warmup, LinkedIn Outreach, and Multichannel sequences. This guide covers a Cold Emailing question: after you launch a campaign, where do you see the emails that didn't get delivered, and what should you do about each one?

How to find the Delivery Issues view

The view lives right where you already look for replies, so you don't have to hunt through settings or reports:

1. Open Inbox from the left sidebar.
2. Make sure you're on the Campaigns tab (the email side of your unified inbox).
3. In the inbox's own left sidebar — alongside Campaigns and Needs Reply — click Delivery Issues.

You'll see a tidy, scannable list. Each row is a single affected recipient and shows:

• Recipient — the email address the message was meant for;
• Campaign — which campaign the send belonged to;
• Sent from — the mailbox that tried to send it;
• Status — a plain-language chip: Bounced or Couldn't send;
• Reason — a one-line, jargon-free explanation of what happened;
• Date — when it happened.

Because it sits next to your replies, "what happened to my sends?" is answered in the same place you check every day — no separate dashboard to remember.

The two kinds of delivery issue

Not every non-delivery means the same thing, so the view sorts each one into one of two clearly labelled stories. Telling them apart matters, because what you should do is different.

Bounced — the address was rejected

A Bounced row means the recipient's mail server rejected the address itself. In plain terms: "The recipient's mail server rejected this address. It may be inactive, mistyped, or no longer exists — it's best to remove or replace it." This is about who you're sending to, not about your mailbox. The person may have left the company, the address may have a typo, or the mailbox may simply no longer exist.

Couldn't send — the message was turned away

A Couldn't send row means the receiving mail server turned the message away even though the address itself may be perfectly fine. In plain terms: "The receiving mail server turned this message away — often a temporary spam or connection block rather than a bad address. These usually clear up on their own, and your other sends keep going." Think of it as the door being closed for a moment, not a wrong address. It's usually temporary, and the rest of your campaign keeps sending normally.

A worked example

Say you launched a campaign to 500 people. A few days in, you open Delivery Issues and see 12 rows marked Bounced and 3 rows marked Couldn't send. Here's how to read that:

• The 12 Bounced rows are addresses that were rejected — inactive, mistyped, or no longer in use. These 12 people were never going to receive your email no matter how many times you tried, so the right move is to remove or replace those addresses. Cleaning them out also protects your sender reputation, which keeps your good emails landing in the inbox.
• The 3 Couldn't send rows are messages that were turned away at the door — usually a brief spam or connection block on the receiving side, not a bad address. These typically clear up on their own, and meanwhile your other 485 sends carry on as normal. The best thing you can do is keep warmup running, which steadily builds the trust that makes receiving servers wave your mail through.

So out of 500, the 12 Bounced are an audience-quality task (fix the list), and the 3 Couldn't send are usually nothing to act on — the numbers tell you at a glance which is which.

What to do about each

For a Bounced address:

1. If it looks like a simple typo (for example jhon@ instead of john@), fix the address on the Prospects page and it can be reached in future campaigns.
2. If the address is genuinely inactive or gone, remove it — there's no benefit to keeping an address that can't receive mail, and trimming it keeps your list healthy.
3. Going forward, verifying addresses before you send is the simplest way to keep bounces low, which in turn keeps your inbox placement strong.

For a Couldn't send message:

1. Usually, do nothing — it's typically a temporary block that clears on its own, and your other sends are unaffected.
2. Keep Email Warmup running. Warmup quietly builds your sender reputation so more of your mail is welcomed straight into the inbox over time.
3. If you see a lot of Couldn't send rows all at once, that can be a sign your sending domain needs a little more reputation-building — sending gently and letting warmup do its work is the fix, never pushing harder.

An empty view is good news

It's worth saying plainly: for most healthy campaigns, Delivery Issues is empty, and you'll see a friendly message — "No delivery issues — all your sends are landing." That is exactly what you want. Nothing here means nothing went wrong. You don't need to check it constantly; it's simply waiting, quietly, in case a delivery ever needs your attention.

One more thing to keep in mind: this view is only about email delivery. LinkedIn and Instagram outreach have their own separate signals and are never shown here, so an empty Delivery Issues view is a clean bill of health for your email sending specifically.

Frequently asked questions

Why didn't my email get delivered?

Open your Inbox, go to the Campaigns tab, and click Delivery Issues in the left sidebar — every email that didn't get through is listed there with a plain-language reason. It falls into one of two cases. Either the recipient's mail server rejected the address (shown as Bounced — the address may be inactive, mistyped, or no longer exists), or the receiving mail server turned the message away (shown as Couldn't send — usually a temporary spam or connection block rather than a bad address). The reason column tells you which one applies to each recipient, so you always know whether it's the address or a temporary block.

What's the difference between Bounced and Couldn't send?

Bounced means the address itself was rejected — the recipient's mail server said that mailbox is inactive, mistyped, or no longer exists, so it's best to remove or replace the address. Couldn't send means the message was turned away even though the address may be fine — often a temporary spam or connection block on the receiving side. Bounced is about who you're sending to; Couldn't send is a momentary closed door that usually clears up on its own while your other sends keep going.

The Delivery Issues view is empty — is something wrong?

No — an empty view is the best possible result. It means all your sends are landing and none of your recipients hit a delivery problem. You'll see the message "No delivery issues — all your sends are landing." There's nothing to fix and nothing to check; the view simply stays empty until, and unless, a delivery ever needs your attention.

What should I do about a bounced address?

If it's a simple typo, correct the address on the Prospects page so the person can be reached in future campaigns. If the address is genuinely inactive or gone, remove it — there's no way to deliver to an address that no longer accepts mail, and trimming it keeps your list clean and protects your sender reputation. Verifying addresses before you send is the easiest way to keep bounces low going forward.

A message shows Couldn't send — do I need to do anything?

Usually not. Couldn't send is typically a temporary block on the receiving server, and it often clears up on its own — meanwhile the rest of your campaign keeps sending normally. The most useful thing you can do is keep Email Warmup running, which steadily builds your sender reputation so more of your mail is welcomed into the inbox over time. If you see many Couldn't send rows at once, send gently and let warmup do its work rather than pushing harder.

Do LinkedIn or Instagram problems show up here?

No. Delivery Issues is strictly about email delivery — it lists email recipients whose messages bounced or couldn't be sent. LinkedIn and Instagram outreach have their own separate signals and status views, so nothing from those channels appears here. That means an empty Delivery Issues view is a clean bill of health specifically for your email sending.

Related reading

• Why was this prospect skipped? — How WarmySender protects your reputation by pausing sends to an address that has already bounced
• My sending domain shows on a blocklist — What a temporary block means and how gentle sending plus warmup builds your reputation back
• Email deliverability & warmup — Why warmup keeps more of your mail out of spam and welcomed into the inbox
• Your prospects — Fix a mistyped address or remove one that's no longer active
• Your campaigns — See how each campaign is sending and performing
• Full documentation — Cold Emailing, Email Warmup, LinkedIn Outreach, and Multichannel guides