> ## Documentation Index > Fetch the complete documentation index at: /docs/llms.txt > Use this file to discover all available pages before exploring further. # turboSMTP FAQ: Accounts, Plans, Sending & Deliverability > Answers to the most common questions about turboSMTP accounts, plans, sending limits, email clients, DNS settings, and deliverability. Find answers about accounts, plans, SMTP, and deliverability. For current allowances and feature availability, check your dashboard and the [pricing page](https://serversmtp.com/pricing/). ## Getting started > [accordion] What is turboSMTP? > > turboSMTP provides an authenticated SMTP relay and an HTTP email API. You can send transactional and permission-based marketing mail, inspect delivery events, and manage suppressions. Feature availability depends on your plan. > [accordion] Where is turboSMTP based, and where are your servers located? > > turboSMTP offers Global and EU sending endpoints. Use `api.eu.turbo-smtp.com` for API sending or `pro.eu.turbo-smtp.com` for SMTP in the EU region. Review [base URLs and processing terms](/docs/api-reference/base-urls.md) for your requirements; endpoint selection does not establish the location of all account data or recipients. > [accordion] Is turboSMTP GDPR compliant? > > Review turboSMTP’s [published data protection information](https://serversmtp.com/regulation-eu-2016-679-gdpr/) and applicable processing agreement. Your own use of personal data, recipient lists, and retention settings also matters. EU sending endpoints alone do not establish your compliance. > [accordion] Do you offer a Free Trial? > > Check the [current free plan](/docs/get-started/free-trial.md). The pricing page currently lists 200 emails per day, valid for the first six months. Demo periods for features such as webhooks and analytics are shorter. > [accordion] Do I need a credit card to activate the free plan? > > See the [free signup and activation requirements](/docs/get-started/free-trial.md). Check the current offer before entering payment details; do not assume a free allowance lasts indefinitely. > [accordion] Is the free plan automatically activated for all new accounts? > > Not instantly. Every new account eligible for the free plan is reviewed by the turboSMTP team before it is activated. You will receive an email notification as soon as your account is ready. This review process usually completes quickly; if you have not heard back within a reasonable time, contact support. > [accordion] Why was my free account closed? > > turboSMTP maintains a quality-of-service policy that applies to all accounts, including free ones. turboSMTP may close a free account whose mail produces a high bounce rate or recipient complaints. Paid accounts receive an alert instead of immediate termination. If you believe your account was closed in error, contact the support team and they will review your case. > [accordion] Can I manage my account online? > > Yes. Use the [dashboard](https://dashboard.serversmtp.com) to manage account details, plans, sending settings, **Analytics**, and **Suppressions**. Available controls depend on your plan and permissions. ## Account & email addresses > [accordion] Is the email address I signed up with the only one I can use as a sender? > > No. You can configure other sender addresses you own or are authorized to use. Your account login is separate from your From address and SMTP username. SMTP uses your Consumer Key and Consumer Secret. > [accordion] Can I use a different sender address from the one I subscribed with? > > Use an address you own or are authorized to use. For domain authentication, use a domain whose DNS you control and verify it in the dashboard. > [accordion] I have multiple email addresses. Should I open multiple accounts? > > One account can send for its configured sender addresses and domains, subject to plan limits. Use [subaccounts](/docs/account/subaccounts.md) if projects or clients need separate credentials and account boundaries. > [accordion] How can I change my password? > > Use the password controls in your dashboard account settings. Your dashboard password is separate from the Consumer Secret used by integrations. See [Authentication](/docs/api-reference/authentication.md) for API password-operation limitations. ## Plans & billing > [accordion] I want to change my plan. Can I? > > Use **Order a new plan** in the dashboard top bar or plan box. Review the offered plan, billing period, and terms before ordering. > [accordion] How can I cancel the auto-renewal of my plan? > > Use the subscription controls provided by the payment processor for your order, or contact support with your order reference. The process depends on how you purchased the plan. > [accordion] What if I want to cancel my monthly plan? > > Check your renewal date and subscription terms, then cancel renewal through your payment processor or contact support. See [Plans and Billing](/docs/account/plans-billing.md). > [accordion] What payment types do you accept? > > The checkout shows the payment methods available for your order. See [Plans and Billing](/docs/account/plans-billing.md) or contact support before arranging a bank transfer. > [accordion] Can I pay by wire transfer? > > Contact support or check the payment options shown at checkout. Use the payment details supplied for your order and confirm activation after payment. > [accordion] My VAT number is not recognized when paying through 2Checkout. Why? > > Check the billing details entered at checkout and the payment processor’s validation message. Contact its support team or turboSMTP support if the issue persists. > [accordion] I made a payment, but my invoice still shows as unpaid. What should I do? > > Check the payment confirmation and order reference. If the dashboard still shows an unexpected status, contact support before submitting another payment. > [accordion] Why is turboSMTP still using free emails after I purchased a paid plan? > > Check the active free and paid allowance periods in the dashboard. Ask support to confirm credit allocation if the displayed balance does not match your order. > [accordion] I just purchased a plan, but I can't send emails. Why? > > Account activation after purchase is not instantaneous. After payment approval, turboSMTP reviews and activates your account. You will receive an email confirmation when your plan is ready. If you have been waiting longer than expected, contact support and reference your payment confirmation. > [accordion] I renewed my plan, but the email counter hasn't updated yet. Why? > > The counter updates after you send an email. A renewal resets the counter for the new period; send one email to refresh it. ## Sending & configuration > [accordion] How many emails can I send per day? What is the maximum attachment size? > > Your allowance depends on your active plan. The free plan currently lists 200 emails per day. The knowledge base lists a maximum of 30 MB per message. For the send API, keep the whole email, including attachments, under 24 MB. Base64 adds roughly one third to binary attachment data before MIME overhead. See [Attachments](/docs/sending/attachments.md). > [accordion] Can I use turboSMTP while travelling? > > Yes, if your network permits the connection and your key’s IP restrictions allow your current source IP. Both SMTP hosts support STARTTLS on 587 or 2525 and implicit TLS on 465 or 25025. Port 25 is also available but often blocked. > [accordion] Which email clients are compatible with turboSMTP? > > Use an email client that supports a custom outgoing SMTP server with authentication and TLS. See the [Outlook and Thunderbird guide](/docs/integrations/email-clients.md); available settings vary by client version. > [accordion] Can I use turboSMTP with Outlook or Thunderbird and send mass emails via CC/BCC? > > For subscription lists, use a tool that manages consent, unsubscribe requests, and suppressions. Addresses in To and Cc are visible to the other recipients. Send separate messages when each recipient should see only their own address. > [accordion] Can I send PDFs as email attachments? > > Yes. Keep the encoded message within the applicable size limit and test the attachment in the mail clients your recipients use. See [Attachments](/docs/sending/attachments.md). > [accordion] My ISP blocks port 25. What can I do? > > Use **587** or **2525** with STARTTLS, or **465** or **25025** with implicit TLS. Global `pro.turbo-smtp.com` and EU `pro.eu.turbo-smtp.com` support the same ports. Match the client encryption setting to the chosen port. ## Deliverability > [accordion] How do I keep track of sent emails? > > Open **Analytics** in the dashboard to inspect delivery status and available engagement events. Use its filters and **Export** action. Retention and feature access depend on your plan. > [accordion] What is a 'dropped' email? > > A dropped message was not delivered. Inspect its reason in **Analytics**; a suppressed recipient is one possible cause. Review the address and its type in **Suppressions** before deciding what to change. > [accordion] Why are my emails going to spam? > > Check authentication and alignment, recipient consent, complaint rates, list quality, and content. Read the message's reason in **Analytics** and inspect received headers. Follow [Spam Issues](/docs/troubleshooting/spam-folder.md) for the detailed checks. > [accordion] How can I configure DKIM, DMARC, and SPF? > > Follow [Email Authentication](/docs/deliverability/spf-dkim-dmarc.md) and copy the exact values provided for your sender domain in the dashboard. Authentication helps receivers verify mail but does not guarantee inbox placement. > [accordion] I cannot configure my domain's DNS. What should I do? > > Ask the DNS administrator to publish the records or use a sending domain you control. See [Email Authentication](/docs/deliverability/spf-dkim-dmarc.md) for fallback behavior and its alignment limitations. > [accordion] What if my sender domain is not verified? (Re-enveloped Sender) > > turboSMTP can rewrite the envelope sender and sign with a provider domain. That can authenticate the provider without aligning with your visible From domain. Verify your domain and inspect received headers; fallback mode does not guarantee delivery or a DMARC pass. > [accordion] The string '[user@user.com](mailto:user@user.com) turbo-smtp.com On behalf of [user@yourdomain.com](mailto:user@yourdomain.com)' appears in the sender field. What does it mean? > > A mail client can show an additional sender label when the message’s sender and authentication headers differ. Verify your sender domain and authentication mode, then inspect the received headers. Display behavior varies by client. > [accordion] How can I get permission to send a newsletter? > > Always use **permission-based email marketing**; send only to recipients who have explicitly opted in. You may send an initial welcome or confirmation email to people who have provided their address, asking them to confirm their subscription. Never purchase email lists or send to addresses that have not consented to receive your messages. > [accordion] How do I get notified about bounces? > > Open **Settings → Notifications → Bounces Management**. Enabling Bounce Notifications sends notifications to turboSMTP; disable the option to receive them yourself, as the dashboard card explains. This setting controls notification routing, not suppression. Review bounced addresses under **Suppressions**. > [accordion] Yahoo emails are stuck in queue with a high complaint rate error. What do I do? > > Read the reason in **Analytics**, reduce unwanted mail, and act on complaints. Check DKIM-domain enrollment in Yahoo’s current Complaint Feedback Loop with support. Enrollment gives complaint reports; it does not clear reputation issues. See [Spam Issues](/docs/troubleshooting/spam-folder.md). > [accordion] What is Smart Routing? > > Smart Routing can retry delivery through another shared IP after a delay, deferral, or temporary block. Ask support whether it is enabled for your plan and sending infrastructure. See [Smart Routing](/docs/deliverability/smart-routing.md). > [accordion] What is the difference between Smart Routing and Dedicated IP Pools? > > Smart Routing concerns retrying through shared IPs. A dedicated IP or pool reserves sending infrastructure for an account and requires reputation management and warm-up. Availability and routing options depend on the plan and configuration; check with support before relying on either feature. ## Support > [accordion] How can I submit a support ticket? > > Log in to the [dashboard](https://dashboard.serversmtp.com), open **? → My Tickets → Submit Ticket**, and provide the error, timestamp, and message or order ID. Remove credentials from anything you attach. Free and Basic list chat and ticket support; Pro and Enterprise also list phone support. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.