# Sending Volume and Warmup > New senders should build trust gradually instead of sending a large campaign immediately. - Human page: https://mailrith.com/guides/start-small - Markdown page: https://mailrith.com/guides/start-small.md - Category: Authentication and Deliverability - Reading time: 4 min read - Related keywords: Sending Volume and Warmup, Sending Volume and Warmup guide, Authentication and Deliverability, Authentication and Deliverability 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. ### Sending Volume and Warmup New senders should build trust gradually instead of sending a large campaign immediately. Sending volume is how much mail you send over a period of time. Warmup is the practice of increasing that volume gradually so inbox providers can see a healthy sending pattern before you send larger campaigns. A new sender does not have much sending history. Sending a large campaign immediately can look risky to inbox providers, especially if the list is old or subscribers are not engaged. Read [Sender Reputation and Spam Rate](https://mailrith.com/guides/sender-reputation-and-spam-rate.md) if you are preparing a new domain or email delivery service. Warmup is not only about numbers. It is about sending wanted email first. A small send to engaged subscribers builds a better signal than a large send to people who forgot they subscribed. Volume spikes can create throttling, deferrals, or reputation drops. If an email delivery service or mailbox server slows your mail, read [SMTP Errors, Deferrals, and Throttling](https://mailrith.com/guides/smtp-errors-deferrals-and-throttling.md) before retrying aggressively. A simple way to reduce risk is to begin with people who are most likely to want the email. This could be recent subscribers, active customers, or people who clicked a recent campaign. Then increase volume as results stay healthy. 1. Confirm SPF, DKIM, DMARC, and alignment before warming up a sender. 2. Start with subscribers who recently signed up, opened, clicked, purchased, or replied. 3. Avoid old imports, inactive subscribers, and uncertain sources during early sends. 4. Send at a steady pace instead of sending one large burst. 5. Review bounces, complaints, unsubscribes, opens, clicks, and replies after each step. 6. Increase volume only when results stay healthy. 7. If throttling, deferrals, bounces, or complaints rise, pause growth and fix the cause. - Start with recent and engaged subscribers when a domain, email delivery service, or sender identity is new. - Avoid sending to old imported lists as the first campaign from a new connection. - Watch [Bounces](https://mailrith.com/guides/bounces.md), [Spam Complaints](https://mailrith.com/guides/spam-complaints.md), unsubscribes, and replies closely after early sends. - Pause and fix the cause if early sends show high bounce or complaint rates. - Keep launch-day campaigns simple until the sender has proved it can deliver well. - Warmup does not repair a bad list. It only gives a good sender a gradual start. - Email delivery service warmup tools can help, but they do not replace permission and list quality. ## Fix Common Issues ### Risky Address Segment A list checker found risky or unknown rows, such as role inboxes, disposable domains, typo risks, or DNS uncertainty. 1. Do not mix risky rows into the first broad campaign. 2. Export the clean rows separately and use those first. 3. Review risky rows manually where possible. 4. If you keep some risky rows, send them in a smaller segment after the sender has healthy results. 5. Watch bounces and complaints closely before increasing volume. > Warmup is not a trick. It is a controlled way to prove that subscribers want the mail before you send more of it. ## Related Guides - [Sender Domains and Email Authentication](https://mailrith.com/guides/sender-domains-and-authentication.md): Your sender domain is the name inboxes learn to trust, and authentication proves that your email delivery service is allowed to send for it. - [From, Reply-To, and Return-Path](https://mailrith.com/guides/from-reply-to-and-return-path.md): An email has several sender-related addresses, and each one has a different job in delivery and replies. - [DNS, PTR, and Reverse DNS](https://mailrith.com/guides/dns-and-reverse-dns.md): DNS records identify your domain, while reverse DNS helps inboxes check whether a sending IP has a sensible hostname.