> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mailofly.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Delivered Email Not Arriving

> How to troubleshoot when Mailofly reports an email as Delivered, but the recipient cannot find it in their inbox.

# Delivered Email Not Arriving

If Mailofly displays the status **Delivered** (`250 2.0.0 OK`), this confirms that the recipient's mail server (e.g. Gmail, Microsoft 365, iCloud) accepted the message over SMTP.

If the recipient claims they cannot find the email, use this troubleshooting checklist:

***

## 1. Check Spam / Junk and Promotions Tabs

* **Gmail**: Check the **Spam** folder and the **Promotions** / **Updates** tabs.
* **Outlook / Hotmail**: Check the **Junk Email** folder and the **Other** tab (under Focused Inbox).
* **Search by Sender**: Ask the recipient to search their mail client for your exact `from` address or message subject.

***

## 2. Corporate Firewalls and Email Security Gateways

Corporate domains frequently route incoming mail through third-party security appliances:

* **Mimecast, Proofpoint, Barracuda, Microsoft Defender**
* These gateways acknowledge receipt (`250 OK`) to the sending MTA, then hold the message in an administrative quarantine or run background sandbox analysis.
* **Fix**: Have the recipient contact their IT administrator to release the email and whitelist your sending domain.

***

## 3. Greylisting and Post-Acceptance Delays

Some mail servers accept mail and temporarily delay final mailbox placement for 5–15 minutes while checking sender reputation.

***

## 4. Check Message-ID in Receiving Server Logs

Every email dispatched by Mailofly has a unique `message_id`. Provide this Message-ID to the recipient's IT department to trace the exact delivery path in their inbound mail server logs.


## Related topics

- [Introduction](/identities/introduction.md)
- [Delivery statuses](/logs/delivery-statuses.md)
- [TLS](/domains/tls.md)
- [Send without a domain (Identities)](/getting-started/identities.md)
- [Avoid Gmail's Spam Folder](/guides/deliverability/avoid-gmail-spam.md)