Blog
Cold email, data and deliverability guides
The LeadCanal cold email blog shares practical guides from the team that builds B2B lists and runs cold email campaigns every week. Read them to find the right contacts, reach the inbox and, finally, get replies.
- Written by practitioners
- Step-by-step how-tos
- Updated as rules change
Latest guides
Browse by topic or read the newest posts first.
SPF Record Examples: Ready-to-Copy Records for Google Workspace, Microsoft 365, Zoho, SendGrid and Multiple Email Senders
Verify Email Address Without Sending Email: Complete Guide to Safe Email Verification
Email Verification API: How to Validate Emails in Real Time and Cut Bounces
B2B Sales Email Verification Techniques That Actually Work
15 Email Deliverability Mistakes Killing Your Cold Outreach
Why Are My Klaviyo Emails Going to Spam? Complete Fix Guide
How to Reduce Email Bounce Rate: 15 Proven Strategies
What Does Authentication Failed Mean on Email? Causes, Fixes & Prevention
How Does Email Warmup Work? A Complete Guide for B2B Marketers
SPF, DKIM and DMARC Setup Database: Complete Email Authentication Guide
Email Deliverability Guide 2026: Improve Inbox Placement and Avoid Spam
What the cold email blog covers
Every guide on this cold email blog comes from client work, so the advice has been tested on real campaigns. First, we cover list building: how to define an ideal customer profile, find decision-makers and verify every address before it reaches your sending tool.
Next comes deliverability. For example, you will find setup guides for SPF, DKIM and DMARC, plus advice on domains, mailboxes and warm-up schedules. We also explain what to check when replies suddenly drop. Because Gmail, Yahoo and Outlook keep changing their sender rules, we update these posts when the rules change.
Finally, we write about the campaign itself, such as subject lines, short first emails and follow-up timing. In addition, we review the tools we use for finding emails and checking copy for spam words. Most guides also link to a free LeadCanal tool, so you can test what you read on your own domain right away.
Further reading
- Google email sender guidelines Gmail requirements for authentication, spam rates and unsubscribe links.
- Yahoo sender best practices What Yahoo Mail expects from bulk and cold email senders.
- FTC CAN-SPAM Act compliance guide The US rules for commercial email, including opt-out handling.
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