Description
Everyone hates spam. Moreover, inboxes are becoming increasingly sophisticated in determining whether something is important, unwanted, or spam.
How email filtering works: Some checks evaluate the content – or lack thereof – of an email for signs of spam, but the sender reputation from the email source usually plays a more important role in the analysis from an Internet Service Provider's perspective.
Why it's important
Mastering deliverability basics ensures that your emails actually reach the inbox, not the spam folder, protecting your sender reputation and maximizing engagement. Without this, even the most brilliant message risks going completely unnoticed.
Permission-based marketing:
- Use a double opt-in system: Only interested parties sign up to receive your email campaigns
- Keep emails relevant: Be clear about what you'll send when people sign up and stick to it
Understanding the email address lifecycle
Keep in mind that valid email addresses can:
Be automatically removed:
- Role-based accounts: If you try to add a role-based account, it will not be uploaded to your list
- Spam traps: Some addresses are automatically flagged and removed
Deteriorate over time:
- Closed accounts: If the recipient closes their email account, these emails are "returned to sender" as permanently undeliverable
- Address changes: People change email addresses and old ones become invalid
- Automatic removal: The message should be removed from the contact list
Benefits of professional email marketing
Professional email marketing services and tools:
- Automatically remove undeliverable addresses
- Handle technical requirements that can affect sender reputation
- Monitor and maintain your sender reputation
- Manage compliance with anti-spam regulations
Timing your email sends
Getting emails delivered is obviously important, but knowing when to send them is too.
Finding the right time:
- No universal recommendation: Timing varies by audience and industry
- Key question: When are your readers most likely to open and act on the email?
- Best approach: Combine understanding of your particular audience and email content with testing
- Continuous optimization: Find the answer that works best for your situation
Key deliverability factors
- Sender reputation: Most important factor in delivery decisions
- Permission-based lists: Only send to people who have subscribed
- Content quality: Relevant and valuable content reduces spam complaints
- List hygiene: Regular cleaning of invalid addresses
- Authentication: Proper domain and email authentication
- Engagement: High open and click rates improve reputation
- Compliance: Following anti-spam laws and regulations
Best practices summary
- Use double opt-in for all subscriptions
- Send relevant content consistently
- Remove bouncing and invalid addresses
- Monitor your sender reputation
- Test sending times for your audience
- Use professional email marketing tools
Troubleshooting
My deliverability rates are declining
- Analyze engagement metrics from the last 3-6 months for trends
- Check if you've changed content style, frequency, or list sources
- Review complaint rates and identify which campaigns triggered complaints
- Consider running a re-engagement campaign to clean your list
Double opt-in is losing too many subscribers
- Optimize the subject line and content of your confirmation email
- Send confirmation emails immediately (within minutes)
- Make the confirmation process as simple as possible (one click)
- Add instructions to check spam folder on your signup thank-you page
I don't know when to send my emails
- Start with industry benchmarks for your sector
- Run A/B tests by sending at different times and days
- Analyze your website traffic patterns for audience activity hours
- Consider time zones if you have a geographically diverse list
My reputation seems damaged but I'm following best practices
- Check if your domain or IP is on blacklists
- Review if team members have sent emails outside normal procedures
- Verify that your list hasn't been compromised or sold
- Consider using a dedicated IP if sharing is affecting your reputation
Related articles
- Authenticating my domain with SPF DKIM and DMARC - Authentication setup
- Fixing emails going to spam - Improve delivery
- Understanding complaints, bounces and unsubscribes - Monitor health
- Getting started - Start correctly
- Creating and managing a contact list - Quality lists