Send Bulk Cold Emails

Sending bulk cold emails feels like a volume game, but it's really an infrastructure game. Most teams fail because they treat it like marketing: they load a giant list into a single account, hit send, and pray. This inevitably leads to blacklisted domains and zero results.

Scaling outbound successfully isn't about finding a magic tool; it's about building a resilient sending engine. It requires a disciplined approach to domains, warmup, and multi-channel sequencing from day one.

Bulk outbound isn't just "more" cold email; it's a fundamentally different challenge. The tactics that work for sending 50 emails a day completely break down at 5,000.

1. Instant Deliverability Collapse: Email service providers like Google and Microsoft impose strict sending limits (around 50/day for new inboxes). Exceeding them, even slightly, across a few accounts gets your entire operation flagged. At bulk volumes, you're not just risking one inbox; you're risking entire domains getting permanently burned.
2. The Personalization vs. Volume Paradox: The more emails you send, the harder it is to personalize. Generic, easily identifiable templates get ignored by prospects and immediately flagged by spam filters. Maintaining relevance across a 10,000-person list without a system is nearly impossible.
3. Crippling Infrastructure Overhead: Manually managing 50, 100, or 200+ sending inboxes is a full-time job. You have to track warmup progress, monitor health, rotate them in and out of campaigns, and handle replies. The complexity grows exponentially with volume.
4. Reputation Contagion: When one domain or inbox gets a bad reputation, it can poison others on the same IP or with similar sending patterns. Without proper isolation (i.e., dedicated sending domains), a single poorly executed bulk campaign can damage your main corporate domain, affecting internal communications and customer emails.

Success in 2025 relies on treating bulk outreach as a distributed system, not a single marketing blast. Discipline and infrastructure are more important than clever copy.

Hyper-Segmentation, Not One Big List: Never send to a monolithic list. Break your audience into smaller, coherent segments based on persona, tech stack, geography, or a specific pain point. This allows for messaging that feels relevant even if it's not 1-to-1 personalized.

A 3-5 Touch Sequence: With bulk sending, persistence pays, but excessive follow-ups increase spam complaints. A 3-5 touch sequence over two weeks is the sweet spot. The goal is to stay top of mind without becoming a nuisance.

Email as the Opener, LinkedIn for the Engaged: Use broad email campaigns to identify interest. Instead of following up with everyone on LinkedIn, reserve that channel for the small percentage who open or click, making your social outreach far more effective.

Example 1: The Simple Question Opener

This email is designed for maximum deliverability. It's short, text-only, and asks a simple question to encourage a reply, which signals positive engagement to email providers.

Subject: Quick question

Hi {{firstName}},

Curious if you're the right person to talk to about managing outbound infrastructure at {{companyName}}?

If not, could you point me in the right direction?

Thanks,
Kurtis

Example 2: Value-Add Follow-Up

If there's no reply, the second touch provides a reason to re-engage without being pushy. It links to a high-level resource, not a sales page.

Subject: Re: Quick question

Hi {{firstName}},

When we talk to other Heads of Growth, they're usually focused on scaling outbound without breaking their domain reputation.

We put together a guide on the infrastructure required to send 100k+ emails a month safely. Might be useful for your team at {{companyName}}.

Worth a look?

When you send in bulk, you are no longer a person sending email. You are an organization managing a mail-sending apparatus, and email providers will treat you as such. The infrastructure you ignored at 100 emails/day becomes the only thing that matters at 10,000/day.

Trying to send bulk from one domain or a handful of inboxes is a predictable failure. You will hit Google or Microsoft's hard sending limits within hours, and your domain's reputation will be permanently damaged. The only way to send significant volume is to distribute it across a large pool of senders.

This is where infrastructure concepts become critical:

1. Dedicated Sending Domains: You must purchase domains separate from your main corporate brand (e.g., get[company].com, [company]hq.com). This isolates your sending reputation, so a failed campaign doesn't take down your entire company's email.
2. Automated Inbox Rotation: To send 5,000 emails a day, you need at least 100-150 inboxes, each sending ~30-50 emails. Manually choosing which inbox to use for each email is impossible. You need a system that automatically rotates through your pool of warmed-up inboxes for every send.
3. Continuous Warmup and Monitoring: Your pool of inboxes isn't static. Some will get flagged or tired. You need a system that is constantly warming up new inboxes to replace old ones and monitoring the health of the entire pool to pull out underperforming assets before they cause a problem.

For teams sending bulk B2B emails, recipients are almost exclusively on Google Workspace and Microsoft 365. These corporate filters are extremely sophisticated. They analyze sender history, volume consistency, and engagement rates. A sudden, massive spike in email from a new, unwarmed domain is the single biggest red flag. Without a distributed infrastructure of dozens or hundreds of slowly warmed domains and inboxes, your bulk sends are guaranteed to land in spam, rendering the entire effort useless.

Bulk doesn't mean one-size-fits-all. The strategy changes based on the goal.

1. Top-of-Funnel Market Research / TAM Validation

1. Who: A very broad list of potential personas in a new market.
2. What: A short, non-salesy email asking one simple question to gauge interest or validate a pain point. The goal is data collection, not booking meetings.
3. Touches: 3 (Email 1 -> Email 2 -> Email 3)
4. Channels: Email only. The scale is too large for manual social touches.

2. Reactivation of a Dead Lead List

1. Who: A list of thousands of old MQLs, webinar attendees, or free trial signups that have gone cold.
2. What: A sequence that references their past engagement and offers a new, relevant piece of content or product update.
3. Touches: 4 (Email 1 -> Email 2 -> LinkedIn Profile View -> Email 3)
4. Channels: Primarily email, with an automated LinkedIn touch to add another layer of visibility.

3. Broad Agency Prospecting

1. Who: Every company in a specific vertical (e.g., all B2B SaaS with 50-200 employees).
2. What: A highly templated but relevant offer that speaks to a universal pain point for that industry. The message is uniform but segmented by persona (e.g., one version for CEOs, another for VPs of Marketing).
3. Touches: 5 (Email 1 -> Email 2 -> Email 3 -> LinkedIn Connect -> Email 4)
4. Channels: Email-first to qualify interest, followed by a LinkedIn connection request only for those who engage (open/click).

The shift happens when you spend more time fixing deliverability problems than talking to prospects. It's the point where your Google Sheets and manual inbox management system collapses under its own weight.

For teams focused on bulk sending, this breaking point arrives quickly—usually once you try to scale past 1,000-2,000 emails per day. Your primary domain gets flagged, your team is constantly getting locked out of inboxes, and your reply rates plummet because you're landing in spam.

This is when outbound stops being a sales task and becomes an infrastructure problem. You don't need another CRM field; you need an engine. You need a platform built for the specific challenges of bulk sending:

1. Automated Domain & Inbox Management: To handle the 100+ sending accounts required for bulk volume without manual intervention.
2. Centralized Deliverability Monitoring: To see your entire sending reputation at a glance and proactively fix issues before they halt your campaigns.
3. Integrated Multi-Channel Sequences: To coordinate email and social touches at scale, so you can use broad email to identify targets for more focused LinkedIn outreach.

SuperSend provides this cold email infrastructure. It's designed for teams who have graduated from simple tools and now face the complex operational challenges of sending 10k to 1M+ emails per month. The next step isn't to just 'try another tool,' but to understand the core strategies for building a scalable outbound system. Exploring specific use cases for high-volume teams is the logical place to start.