---
title: Troubleshoot marketing email delivery in Infinity3
description: "Use these checks when a campaign fails to send, bounces or reaches a recipient’s spam folder. #### Before you start Note the campaign, recipient, send time and message status. Identify whether the issue affects one address or a wider audience.…"
url: "https://www.infinity3.co.uk/help/troubleshoot-marketing-email-delivery-in-infinity3/"
updated: "2026-10-08"
category: Infinity3 Platform / Email Marketing
---

# Troubleshoot marketing email delivery in Infinity3

Use these checks when a campaign fails to send, bounces or reaches a recipient’s spam folder.

#### Before you start

Note the campaign, recipient, send time and message status. Identify whether the issue affects one address or a wider audience.

#### Review the result

1. Open the campaign’s reporting or available email activity.
2. Record the exact failure or bounce information.
3. Check the recipient address for errors.
4. Review their email preferences, DND and any suppression restriction.
5. Check the sending domain’s verification and the campaign’s sender-domain warnings.
6. Review any account sending restriction or billing error.

Different errors require different fixes. Reconnecting a personal inbox will not resolve every marketing-email problem.

#### If the message reaches spam

Review authentication and sender setup, then examine the audience and content. Use a recognisable sender, clear subject and relevant message for people who expect to hear from you.

For a new sending domain, review the sending-volume plan before increasing campaign size. If widespread problems appear, pause further bulk sends while investigating.

#### Things to know

- Address validation does not guarantee delivery or inbox placement.
- A delivered status does not confirm the recipient read the email.
- Do not repeatedly resend to bounced or suppressed addresses.
- External SMTP issues may also need investigation by that provider.

Contact Infinity3 with the campaign, affected address, status, error and checks completed. Hide unrelated contact information in screenshots.