--- title: "Understanding Email Account Disconnection Reasons in Smartlead" description: "Here are some common reasons why email accounts may get disconnected in Smartlead" url: https://helpcenter.smartlead.ai/en/articles/65-understanding-email-account-disconnection-reasons-in-smartlead collection: "Email Disconnection Errors" updated: 2026-11-10 language: en --- # Understanding Email Account Disconnection Reasons in Smartlead Here are some common reasons why email accounts may get disconnected in Smartlead This article covers the most common reasons why email accounts get disconnected in Smartlead, along with practical fixes and a recovery checklist. Keeping your mailboxes healthy requires consistent sending behaviour, correct authentication, and good list hygiene. ## Possible reasons a mailbox connection can be interrupted by ESP 1. **Sending pattern and pacing** - Emails sent less than 10 minutes apart - Total daily volume exceeding safe caps (warmup + outbound combined) - Sudden spikes in volume after a quiet period - Same mailbox used by multiple campaigns without spacing - Using two sender tools at once, for example Smartlead and a competitor 2. **Warmup and migration** - Outbound starts before completing an initial warmup period - Switching from another sender or warmup tool without re-ramping - Importing “pre-warmed” mailboxes but not giving them time on Smartlead infrastructure 3. **Reputation and list quality** - Bounce rate consistently above 3 to 5 percent - Recipients marking messages as spam - Overused or low-reputation sending domain or tracking domain 4. **Authentication or credential changes** - Password or 2FA changed, OAuth token expired or revoked - SMTP or IMAP credentials updated but not refreshed in Smartlead 5. **Provider safety controls** - Temporary throttles or policy checks from Microsoft 365 or Google - Suspicious sign-in prompts that require re-consent 6. **Domain configuration** - Missing or misaligned **SPF**, **DKIM**, **DMARC** ## Fixes by scenario **A. Sending pattern and pacing** - Set a **minimum time gap** of **10 to 15 minutes** per mailbox - Keep daily caps within **40 to 50** during early stages and include **warmup + outbound** - Stagger campaigns so one mailbox does not send from multiple schedules at once - Use **one sending platform per mailbox** **B. Warmup and migration** - Re-ramp on Smartlead with a conservative path for new or cold mailboxes: - **Days 1 to 7:** 5 to 10 emails per day - **Days 7 to 14:** 10 to 20 emails per day - **Days 14 to 21:** 30 to 50 emails per day - Review SmartDelivery results before increasing caps **C. Reputation and list quality** - Clean lists regularly, suppress hard bounces and role addresses - Target precisely and keep copy user-friendly to limit complaints - Use a clean sending domain and a **branded tracking domain** **D. Authentication or credential changes** - Reconnect the mailbox and complete OAuth prompts - If using SMTP, update credentials and app-passwords where required **E. Provider safety controls** - Reduce pace and total volume, then resume gradually - Align sending windows to recipient business hours **F. Domain configuration** - Validate **SPF**, **DKIM**, **DMARC** for the sending domain - Keep the From name and From address consistent across campaigns ## Quick recovery checklist 1. Open **Mailboxes** and confirm the status of the affected mailbox 2. **Reconnect** and complete OAuth or refresh SMTP credentials 3. Lower the **daily cap** to a safe level that includes warmup + outbound 4. Set **minimum time gap** to **10 to 15 minutes** 5. Pause overlapping campaigns sharing the same mailbox 6. Clean recent **bounces** or complaint sources, then re-ramp using the schedule above 7. Run a **SmartDelivery** test before scaling ## Healthy sending defaults - Minimum gap: **10 to 15 minutes** between consecutive sends - Daily cap during early stages: **40 to 50 total** (warmup + outbound) - Warmup path: **5–10 → 10–20 → 30–50** over 21 days - One platform per mailbox; avoid overlapping schedules ## Where to find the controls in Smartlead - **Mailbox settings:** minimum time gap and daily cap - **Campaign schedule:** pacing and staggering - **SmartDelivery:** seed list tests and placement results - **Master Inbox:** reply monitoring and quick list actions ## Related articles - [Outlook Tenant Error 550 5.7.708 Access Denied](https://helpcenter.smartlead.ai/en/articles/81-outlook-tenant-error-550-57708-access-denied.md) - [Google Error 534 5.7.9 Application Specific Password Required](https://helpcenter.smartlead.ai/en/articles/79-google-error-invalid-login-534-579-application-specific-password-required.md) - [Troubleshooting Sending Quota Exceeded](https://helpcenter.smartlead.ai/en/articles/22-troubleshooting-sending-quota-exceeded-error.md) - [Data Command Failed 550 5.4.5 Daily User Sending Quota Exceeded](https://helpcenter.smartlead.ai/en/articles/45-data-command-failed-550-545-daily-user-sending-quota-exceeded.md) ## FAQs **Does warmup count toward my daily cap?** Yes. Warmup and outbound sends together make up your total daily send count. **What minimum time gap should I use?** Set 10 to 15 minutes per mailbox. Increase the gap as you raise your daily volume. **Can I use another sending tool alongside Smartlead?** Use one platform per mailbox to avoid double scheduling. If another tool is needed, dedicate a separate mailbox to it. **How long should I warm up before scaling?** At least 14 days for new or cold mailboxes. Scale gradually based on SmartDelivery results. **Where can I adjust these settings?** Mailbox settings control the time gap and daily cap. Campaign schedules handle pacing. SmartDelivery and Master Inbox help you monitor placement and mailbox health.