# Troubleshooting Common Sending Problems



> Most sending issues can be narrowed down by checking setup, subscribers, content, email delivery service, and subscriber status.



- Human page: https://mailrith.com/guides/troubleshooting

- Markdown page: https://mailrith.com/guides/troubleshooting.md

- Category: Learn and Fix

- Reading time: 4 min read

- Related keywords: Troubleshooting Common Sending Problems, Troubleshooting Common Sending Problems guide, Learn and Fix, Learn and Fix guide, email sending guide, email marketing guide, email deliverability guide



## AI Agent Notes

- Use this page as plain-language guidance for the specific email sending issue named in the title.

- Preserve the distinction between Mailrith, an email delivery service, DNS, and inbox providers when explaining fixes.

- When a user is running a free tool, pair the tool result with the relevant issue or step section from this guide.



### Troubleshooting Common Sending Problems

Most sending issues can be narrowed down by checking setup, subscribers, content, email delivery service, and subscriber status.

When something goes wrong, do not guess from the final symptom. Walk backward through the send.

First ask whether the campaign was configured correctly. Then check the delivery connection. Then check your email delivery service. Then check the subscriber's status and inbox. This sequence usually finds the cause faster than changing several things at once.

- If the delivery connection is missing, check that it is enabled and assigned to the current workspace.
- If the test email fails, check email delivery service credentials, sender verification, region, email delivery service account status, and the exact error message. For authentication failures, start with [Sender Domains and Email Authentication](https://mailrith.com/guides/sender-domains-and-authentication.md).
- If subscribers did not receive the campaign, check whether the campaign actually sent, whether the subscriber count was correct, and whether subscriber statuses allowed sending.
- If emails land in spam, review sender authentication, list quality, complaint rate, content, links, and whether the sender is new. Use [DMARC Alignment](https://mailrith.com/guides/dmarc-alignment.md) and [Sender Reputation and Spam Rate](https://mailrith.com/guides/sender-reputation-and-spam-rate.md) to narrow the cause.
- If links are wrong, fix the URL in the draft or template and send a new test before sending again.
- If results are missing, confirm open or click tracking is enabled and email delivery service webhooks are configured where needed.
- If the subscriber count is too large or too small, open the segment and check each rule in plain language.



## Related Guides

- [Read the Results](https://mailrith.com/guides/read-results.md): After sending, look at delivery, opens, clicks, unsubscribes, bounces, and complaints together.

- [Handle Bounces, Complaints, and Unsubscribes](https://mailrith.com/guides/handle-bounces-and-complaints.md): Delivery events protect future sends by keeping risky addresses out of normal campaigns.

- [SMTP Errors, Deferrals, and Throttling](https://mailrith.com/guides/smtp-errors-deferrals-and-throttling.md): SMTP errors and email delivery service responses explain whether a delivery problem is temporary, permanent, or caused by rate limits.