> ## Content Index > Fetch the complete content index at: https://agentsdr.ai/blog/llms.txt > Use this file to discover other available public pages before exploring further. # How to Use AI SDRs Without Burning Your Domain - URL: https://agentsdr.ai/blog/how-to-use-ai-sdrs-without-burning-your-domain/ - Published: 2026-11-02T01:48:41.000Z - Updated: 2026-11-02T01:48:41.000Z - Author: Pulkit Garg - Tags: Sales Strategy, B2B Marketing, Sales Outreach, B2B Sales, Source-Available CRM > **Quick Summary:** Use separate secondary domains for AI SDR outreach, with SPF, DKIM, and DMARC configured and 2-3 mailboxes warmed over 3-4 weeks before ramping sends. Keep each mailbox near 30-50 cold emails daily, Gmail spam rates near 0.1%, and bounce rates below 3%, while verifying contacts, suppressing existing customers, and pacing multi-channel follow-up. Pause sending and return to warmup if spam rates exceed 0.3% or bounces rise above 3%, and monitor delivery metrics weekly. AgentSDR CRM is presented as a self-hosted platform that combines warmup, sequences, and CRM contact controls to protect the primary domain. Two weeks in, your AI SDR shows 400 sends a day and zero replies. Every email lands in spam, and it took your support domain down with it. That's the cost of skipping domain warmup. This guide walks through a threshold-driven setup, using AgentSDR CRM as the outbound sales platform example, so your cold email deliverability holds and AgentSDR CRM users protect the domains customers already trust. ## Step 1: Warm Up Secondary Domains and Mailboxes Before Launch Before an AI SDR sends anything, your domain warmup must be done: register secondary sending domains, set SPF, DKIM and DMARC, warm 2-3 mailboxes per domain for 3-4 weeks, start at 5-10 emails a day, ramp slowly, and only launch once replies land in the primary inbox. ### How many domains and mailboxes to start with Buy one or two secondary domains that match, never your main one. Run 2-3 mailboxes per domain so a single inbox stays under the safe ceiling of about 30-50 cold emails a day. ### The warmup volume ladder Ramp like this: 1. Week 1: 5-10 emails a day, mostly warmup network replies 2. Week 2: 15-20, adding light human sends 3. Week 3-4: 30-40, near your real [cold email](https://mailivery.io/blog/email-warmup-guide?ref=agentsdr.ai) volume ### What signals tell you a mailbox is ready You're ready when warmup emails land in the inbox, not spam, and Gmail Postmaster Tools shows a spam rate under 0.3%. Check [outbound email sequences](https://agentsdr.ai/blog/outbound-email-sequences-best-practices-for-2026/) practices before scaling, and confirm AgentSDR CRM tracks bounce rates below 3% per campaign. ## Step 2: Set Authentication, Compliance, and Legal Guardrails Gmail spam rate limits are simple: stay under 0.3%, aim for 0.1%. Bulk senders who cross 0.3% lose mitigation support, so build your AI SDR around these caps from day one. ### Authentication is the entry ticket Set up **SPF**, **DKIM**, and **DMARC** on every secondary sending domain before the first send. Skip one and mailbox providers treat your cold email as spoofed. Google enforces this for bulk senders under its [email sender guidelines](https://support.google.com/mail/answer/14229414?hl=en-GB&ref=agentsdr.ai). ![Outbound email server passing domain authentication checks](https://assets.snowseo.com/organization-813abc9e-b233-44b2-ae76-4bd670b7e4d1/brand-AVL2vKVjiWQW6NcVCE7IuAQxROLy29ss/library/ai-images/ai-image-1793584058916-e3kpx.webp) Outbound email server passing domain authentication checks ### Complaint rate thresholds to configure Watch Gmail Postmaster Tools daily and set alerts at these levels: - **0.08%**: healthy, keep scaling - **0.1%**: Google's recommended ceiling; pause and review - **0.3%**: hard limit, mitigation is refused ### Legal obligations automation does not remove An AI SDR still needs a physical address, a working unsubscribe route, and honest subject lines under laws like CAN-SPAM and India's DPDP Act. Suppression lists matter too: anyone who opted out stays out, whatever the sequence says. ## Step 3: Configure the Agent for Verified, Paced, Multi-Channel Outreach Keep email deliverability high by controlling three things before the agent ever hits send: 1. Verify every contact on the list. 2. Suppress anyone already in your CRM. 3. Pace each channel under its daily cap. ### Validate before the first touch Run email list verification before each campaign. Drop catch-all and role-based addresses, and set a bounce ceiling of 3% per send. Any higher, and Gmail's filters flag your domain even if your warmup was perfect. ### Check the CRM before cold email Deduplicate against your pipeline. Suppressing current customers and open opportunities protects revenue and removes sends that never convert. AgentSDR CRM handles this classification before sequences launch, so the agent only works net-new contacts. ### Sequence channels without over-contacting Space touches 3-4 days apart and cap total contact at 4-5 per person. A [coordinated cadence across email and phone](https://agentsdr.ai/blog/coordinated-cadences-top-platforms-for-email-and-phone/) lets LinkedIn or a call carry the follow-up instead of another email to the same inbox. ## Step 4: Monitor Sending Health and Know How to Recover Should AI SDR cold email send from your primary domain? No. Send from secondary domains only, so your main domain stays safe even if cold email deliverability slips. If health drops, fix the sending domains, not your brand domain. ### The four metrics to review weekly Track spam rate in Gmail Postmaster Tools (keep it near 0.1%), bounce rate (under 3%), open and reply rates by mailbox, and blacklist status. Review these every Monday before new sends go out. ### Pause rules and the recovery playbook Pause the whole domain when spam rate crosses 0.3% or bounces exceed 3%. Then cut volume to warmup-only for two weeks, fix list quality and SPF, DKIM, DMARC, and resume slowly. Setting clear sending limits per mailbox helps here, as covered in this guide to cold email sending limits. ![AgentSDR homepage](https://assets.snowseo.com/organization-813abc9e-b233-44b2-ae76-4bd670b7e4d1/brand-AVL2vKVjiWQW6NcVCE7IuAQxROLy29ss/screenshots/screenshot-homepage.webp?v=1791275107468) AgentSDR homepage Your domain can be saved before it's burned. [AgentSDR](https://agentsdr.ai/?ref=agentsdr.ai) gives you self-hosted warmup, sequences and CRM in one place. Start your first safe campaign today. ## Frequently Asked Questions ### Q1: What domain warmup steps should I take before launching an AI SDR? Buy secondary domains, set SPF, DKIM and DMARC, then warm 2-3 mailboxes per domain for 3-4 weeks. Start at 5-10 emails daily, ramp slowly, and launch only once replies land in the primary inbox. ### Q2: Should cold email ever send from my main domain? No. Use secondary sending domains only, so a deliverability slip never damages the domain customers already trust. ### Q3: What metrics tell me to pause sending? Pause when the Gmail Postmaster Tools spam rate crosses 0.3% or bounces exceed 3%. Then run warmup-only for two weeks before resuming slowly. ## Conclusion Safe AI SDR outreach comes down to warmup, authentication, pacing and weekly monitoring. Thresholds like a 0.3% spam rate protect cold email deliverability, and AgentSDR CRM supports self-hosted outbound across secondary sending domains.