Cold Email Infrastructure Built for Scale

Cold email infrastructure refers to the technical setup that enables sending bulk unsolicited but permission-based emails to new recipients. It includes dedicated IP addresses, sending domains, authentication records (SPF/DKIM/DMARC), IP warming schedules, and inbox rotation to maximize deliverability and protect sender reputation.

Inbox rotation is the practice of sending emails from multiple IP addresses and sending domains in a rotating sequence to distribute sending volume and protect reputation. If one IP gets flagged, the others maintain deliverability. CloudMails automates rotation based on your campaign schedule.

IP warmup typically takes 4-8 weeks for new dedicated IPs. The process involves gradually increasing email volume from 50 daily emails to full capacity, allowing mailbox providers like Gmail and Outlook to build a positive reputation for your IP address.

Yes, cold email is legal when done correctly. In the US, the CAN-SPAM Act governs commercial emails. In Europe, GDPR and ePrivacy regulations apply. Key requirements include: identifiable sender, physical address, easy opt-out mechanism, and honoring opt-outs within 10 days.

Daily sending limits depend on your plan and IP reputation. Starting limits are typically 500-1,000 emails per IP per day during warmup, scaling to 5,000-10,000 emails per IP per day once reputation is established. CloudMails automatically manages these limits based on your warming schedule.

A sending domain is the domain name that appears in the From address of your emails (e.g., hello@yourdomain.com). Multiple sending domains allow you to separate different campaigns or brands, reducing risk if one domain gets flagged. Best practice is to use a separate domain from your main website domain.

Cold email is permission-based outreach to recipients who haven't opted in to your list but may be interested in your offer. It's targeted, relevant, and provides value. Spam is unsolicited bulk email sent indiscriminately to harvested lists, often deceptive or misleading. Legal cold email includes clear sender identification and easy opt-out mechanisms.

Yes, using multiple sending domains is a best practice for cold email. Each domain has its own reputation, so spreading your sending across multiple domains reduces risk. If one domain gets flagged, your other campaigns continue unaffected. We recommend at least 3-5 domains for moderate volume campaigns.