---
name: newsletter-publishing
description: Email newsletter workflows. Use when creating newsletters, building subscriber lists, designing templates, or tracking engagement.
---

# Newsletter publishing

Practical workflows for building and managing email newsletters for journalism and academia.

## When to activate

- Creating a new newsletter from scratch
- Designing email templates for journalism content
- Building and segmenting subscriber lists
- Analyzing newsletter performance metrics
- Planning editorial calendars for newsletters
- Migrating between newsletter platforms
- Improving deliverability and open rates

## Newsletter architecture

### Content strategy framework

```markdown
## Newsletter strategy document

### Core identity
- **Name**:
- **Tagline** (one line):
- **What readers get**: [specific value proposition]
- **Frequency**: [ ] Daily [ ] Weekly [ ] Bi-weekly [ ] Monthly

### Target audience
- Primary reader:
- What they care about:
- Why they'll subscribe:
- What they'll do with this info:

### Content pillars
1. [Core topic 1] - [how often]
2. [Core topic 2] - [how often]
3. [Recurring feature] - [how often]

### Voice and tone
- Formal ↔ Conversational: [1-5]
- Serious ↔ Light: [1-5]
- Reported ↔ Personal: [1-5]

### Success metrics (first 6 months)
- Subscriber goal:
- Target open rate:
- Target click rate:
```

### Issue structure template

```markdown
## [Newsletter Name] - Issue #[XX]
**Date**: [Date]
**Subject line**: [Subject]
**Preview text**: [First 50-90 characters readers see]

---

### Opening hook
[2-3 sentences that make readers want to keep reading]

### Main story
[Your primary content - 300-600 words for most newsletters]

### Secondary items (if applicable)
- **Quick hit 1**: [Brief item with link]
- **Quick hit 2**: [Brief item with link]

### Recurring section
[Weekly column, data point, recommendation, etc.]

### Sign-off
[Personal note, call to action, or preview of next issue]

---

**Unsubscribe** | **Preferences** | **Forward to a friend**
```

## Technical implementation

### HTML email template (responsive)

```html
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>{{newsletter_name}}</title>
  <style>
    /* Reset styles for email clients */
    body { margin: 0; padding: 0; width: 100%; }
    table { border-collapse: collapse; }
    img { border: 0; display: block; }

    /* Responsive container */
    .container {
      max-width: 600px;
      margin: 0 auto;
      font-family: Georgia, serif;
      font-size: 18px;
      line-height: 1.6;
      color: #333;
    }

    /* Dark mode support */
    @media (prefers-color-scheme: dark) {
      .container { background-color: #1a1a1a; color: #e0e0e0; }
      a { color: #6db3f2; }
    }

    /* Mobile styles */
    @media only screen and (max-width: 480px) {
      .container { padding: 15px !important; }
      h1 { font-size: 24px !important; }
    }
  </style>
</head>
<body>
  <table role="presentation" width="100%">
    <tr>
      <td align="center" style="padding: 20px;">
        <div class="container">
          <!-- Header -->
          <table width="100%">
            <tr>
              <td style="padding-bottom: 20px; border-bottom: 2px solid #333;">
                <h1 style="margin: 0;">{{newsletter_name}}</h1>
                <p style="margin: 5px 0 0; color: #666;">{{issue_date}}</p>
              </td>
            </tr>
          </table>

          <!-- Content -->
          <table width="100%">
            <tr>
              <td style="padding: 30px 0;">
                {{content}}
              </td>
            </tr>
          </table>

          <!-- Footer -->
          <table width="100%">
            <tr>
              <td style="padding-top: 20px; border-top: 1px solid #ddd; font-size: 14px; color: #666;">
                <p>You're receiving this because you subscribed to {{newsletter_name}}.</p>
                <p>
                  <a href="{{unsubscribe_url}}">Unsubscribe</a> |
                  <a href="{{preferences_url}}">Update preferences</a>
                </p>
              </td>
            </tr>
          </table>
        </div>
      </td>
    </tr>
  </table>
</body>
</html>
```

### Python newsletter sender

```python
from dataclasses import dataclass, field
from datetime import datetime
from typing import List, Dict, Optional
from enum import Enum
import hashlib

class SubscriberStatus(Enum):
    ACTIVE = "active"
    UNSUBSCRIBED = "unsubscribed"
    BOUNCED = "bounced"
    COMPLAINED = "complained"

@dataclass
class Subscriber:
    email: str
    name: Optional[str] = None
    subscribed_at: datetime = field(default_factory=datetime.now)
    status: SubscriberStatus = SubscriberStatus.ACTIVE
    tags: List[str] = field(default_factory=list)
    custom_fields: Dict = field(default_factory=dict)

    @property
    def hash_id(self) -> str:
        """Generate unique ID for unsubscribe links."""
        return hashlib.md5(self.email.encode()).hexdigest()[:12]

@dataclass
class NewsletterIssue:
    subject: str
    preview_text: str
    html_content: str
    plain_text: str
    scheduled_at: Optional[datetime] = None
    sent_at: Optional[datetime] = None
    issue_number: int = 0

    # Metrics
    sent_count: int = 0
    delivered_count: int = 0
    opened_count: int = 0
    clicked_count: int = 0
    bounced_count: int = 0
    unsubscribed_count: int = 0

    @property
    def open_rate(self) -> float:
        if self.delivered_count == 0:
            return 0.0
        return (self.opened_count / self.delivered_count) * 100

    @property
    def click_rate(self) -> float:
        if self.delivered_count == 0:
            return 0.0
        return (self.clicked_count / self.delivered_count) * 100

class NewsletterManager:
    """Core newsletter operations."""

    def __init__(self, name: str):
        self.name = name
        self.subscribers: List[Subscriber] = []
        self.issues: List[NewsletterIssue] = []

    def add_subscriber(self, email: str, name: str = None,
                       tags: List[str] = None) -> Subscriber:
        """Add new subscriber with double opt-in pending."""
        sub = Subscriber(
            email=email.lower().strip(),
            name=name,
            tags=tags or []
        )
        self.subscribers.append(sub)
        return sub

    def segment_subscribers(self, tags: List[str] = None,
                           min_engagement: float = None) -> List[Subscriber]:
        """Get subscribers matching criteria."""
        active = [s for s in self.subscribers
                  if s.status == SubscriberStatus.ACTIVE]

        if tags:
            active = [s for s in active
                     if any(t in s.tags for t in tags)]

        return active

    def calculate_engagement_score(self, subscriber: Subscriber) -> float:
        """Score subscriber engagement 0-100."""
        # Implementation would track opens/clicks per subscriber
        return 50.0  # Placeholder
```

## Subscriber management

### List hygiene workflow

```python
from datetime import datetime, timedelta

def clean_subscriber_list(manager: NewsletterManager,
                         inactive_threshold_days: int = 180) -> dict:
    """Identify and handle inactive subscribers."""
    cutoff = datetime.now() - timedelta(days=inactive_threshold_days)

    results = {
        'total': len(manager.subscribers),
        'active': 0,
        'inactive': [],
        'bounced': [],
        'unsubscribed': []
    }

    for sub in manager.subscribers:
        if sub.status == SubscriberStatus.BOUNCED:
            results['bounced'].append(sub.email)
        elif sub.status == SubscriberStatus.UNSUBSCRIBED:
            results['unsubscribed'].append(sub.email)
        elif sub.status == SubscriberStatus.ACTIVE:
            # Check last engagement
            engagement = manager.calculate_engagement_score(sub)
            if engagement < 10:  # Very low engagement
                results['inactive'].append(sub.email)
            else:
                results['active'] += 1

    return results

def run_reengagement_campaign(inactive_subscribers: List[str]) -> None:
    """Send win-back campaign to inactive subscribers."""
    # Send "We miss you" campaign
    # If no engagement after 2 attempts, mark for removal
    pass
```

### Subscriber segmentation

```markdown
## Recommended segments

### By engagement
- **VIPs**: Open rate > 80%, always click
- **Engaged**: Open rate 40-80%
- **Casual**: Open rate 10-40%
- **At-risk**: Haven't opened in 90 days
- **Inactive**: Haven't opened in 180 days

### By interest (tag-based)
- Topic preferences from signup
- Content they've clicked
- Surveys/polls they've answered

### By source
- Organic (website signup)
- Referral (forwarded by friend)
- Social media
- Paywall/registration wall
```

## Subject line optimization

### High-performing patterns

```markdown
## Subject line formulas that work

### For news/journalism
- **Breaking format**: "Breaking: [Concise news]"
- **Numbers**: "[X] things we learned about [topic]"
- **Question**: "Why did [entity] do [thing]?"
- **Direct**: "[Topic]: What you need to know"

### For analysis/opinion
- **Take**: "The real story behind [event]"
- **Contrarian**: "Why everyone is wrong about [topic]"
- **Insider**: "What [industry] insiders know about [topic]"

### What to avoid
- ALL CAPS
- Excessive punctuation!!!
- Clickbait that doesn't deliver
- Spam trigger words (FREE, URGENT, ACT NOW)
- Misleading preview text
```

### A/B testing framework

```python
import random
from typing import List, Tuple

def ab_test_subject_lines(subscribers: List[Subscriber],
                         subject_a: str,
                         subject_b: str,
                         test_percentage: float = 0.2) -> dict:
    """
    Test two subject lines on subset before full send.
    """
    test_size = int(len(subscribers) * test_percentage)
    test_group = random.sample(subscribers, test_size)

    # Split test group
    half = len(test_group) // 2
    group_a = test_group[:half]
    group_b = test_group[half:]

    remaining = [s for s in subscribers if s not in test_group]

    return {
        'group_a': {
            'subject': subject_a,
            'subscribers': group_a,
            'size': len(group_a)
        },
        'group_b': {
            'subject': subject_b,
            'subscribers': group_b,
            'size': len(group_b)
        },
        'remaining': {
            'subscribers': remaining,
            'size': len(remaining),
            'note': 'Send winner to this group after test period'
        },
        'test_duration_hours': 4
    }
```

## Deliverability best practices

### Email authentication setup

```markdown
## DNS records for deliverability

### SPF record
```
v=spf1 include:_spf.{{esp_sending_domain}} ~all
```

### DKIM
- Generate keys through your ESP
- Add TXT record with public key
- Verify signature is applied to outgoing mail

### DMARC
```
v=DMARC1; p=quarantine; rua=mailto:dmarc@yourdomain.com
```

### Checklist before sending
- [ ] SPF, DKIM, DMARC configured
- [ ] Sending domain warmed up
- [ ] List is clean (no hard bounces)
- [ ] Unsubscribe link works
- [ ] Physical address in footer (CAN-SPAM)
- [ ] Test email received in inbox (not spam)
```

### Gmail, Yahoo, and Outlook bulk-sender requirements

Bulk senders must meet authentication and unsubscribe requirements introduced by Gmail and Yahoo in February 2024. Microsoft Outlook adopted a parallel set in May 2025. Since November 2025, Gmail rejects non-compliant mail with permanent 5xx errors rather than soft-deferring it, non-compliant newsletters now bounce hard.

**Who is covered.** A "bulk sender" is one mailing more than 5,000 messages per day to Gmail addresses. The 5,000 threshold is counted at the **primary domain level across all subdomains**, not per sending subdomain. A newsroom sending 2,500/day from `transactional.example.com` and 2,500/day from `news.example.com` is over the threshold.

**Required:**

- **SPF and DKIM authentication on the sending domain.** Both must pass. SPF alone is no longer sufficient. DKIM keys must be at least 1024 bits.
- **DMARC policy at minimum `p=none`.** Production senders should move to `p=quarantine` or `p=reject` once aligned.
- **Domain alignment.** **One** of SPF or DKIM must align with the organizational domain in the visible `From:` header, not both. Relaxed alignment is acceptable.
- **One-click unsubscribe (RFC 8058).** The mail must include a `List-Unsubscribe` header with an HTTPS URL and a `List-Unsubscribe-Post: List-Unsubscribe=One-Click` header. The HTTPS endpoint must process the unsubscribe within two days without requiring login. A visible unsubscribe link must also appear in the message body.
- **Spam complaint rate below 0.3 percent**, measured in Google Postmaster Tools. Google's recommended target ceiling is 0.1 percent; sustained rates above 0.3 percent trigger rejection.
- **Valid PTR record (reverse DNS) on the sending IP.** Forward and reverse DNS must match.
- **TLS for inbound connections** (Google requirement since December 2023).

**Operational implications:**

Most reputable ESPs handle authentication, headers, and TLS once the sending domain is verified. The two parts that remain the operator's responsibility are complaint rate and unsubscribe behavior, re-engagement campaigns and prompt list hygiene matter here. Re-engaging dormant subscribers is risky precisely because they complain at 5–10× the rate of active ones; one bad re-engagement campaign can push complaint rate over 0.3 percent and trigger rejections across the entire sending domain.

References:
- Google, *Email sender guidelines*, `support.google.com/mail/answer/81126`
- Google, *Email sender guidelines FAQ*, `support.google.com/a/answer/14229414`
- Yahoo, *Sender Best Practices*, `senders.yahooinc.com/best-practices/`

### Spam score checklist

```markdown
## Before you send

### Content checks
- [ ] No spam trigger words
- [ ] Text-to-image ratio good (mostly text)
- [ ] All links are to reputable domains
- [ ] No URL shorteners (use full links)
- [ ] Plain text version included

### Technical checks
- [ ] From address matches sending domain
- [ ] Reply-to address is monitored
- [ ] Preheader text is set
- [ ] Images have alt text
- [ ] Links are not broken
```

## Analytics and optimization

### Key metrics dashboard

```python
from dataclasses import dataclass

@dataclass
class NewsletterAnalytics:
    """Track newsletter performance over time."""

    issue: NewsletterIssue

    def summary(self) -> dict:
        return {
            'issue_number': self.issue.issue_number,
            'sent': self.issue.sent_count,
            'delivered': self.issue.delivered_count,
            'delivery_rate': self._pct(self.issue.delivered_count,
                                       self.issue.sent_count),
            'opens': self.issue.opened_count,
            'open_rate': self.issue.open_rate,
            'clicks': self.issue.clicked_count,
            'click_rate': self.issue.click_rate,
            'click_to_open': self._pct(self.issue.clicked_count,
                                       self.issue.opened_count),
            'unsubscribes': self.issue.unsubscribed_count,
            'unsubscribe_rate': self._pct(self.issue.unsubscribed_count,
                                          self.issue.delivered_count),
        }

    def _pct(self, numerator: int, denominator: int) -> float:
        if denominator == 0:
            return 0.0
        return round((numerator / denominator) * 100, 2)

# Benchmarks (journalism newsletters)
BENCHMARKS = {
    'open_rate': {'good': 40, 'excellent': 55},
    'click_rate': {'good': 4, 'excellent': 8},
    'unsubscribe_rate': {'acceptable': 0.5, 'concerning': 1.0},
}
```

## Platform comparison

| Platform | Best for | Pricing model | Key feature |
|----------|----------|---------------|-------------|
| Substack | Writer-first, paid subs | Revenue share | Built-in payments |
| Buttondown | Developers, minimal | Per subscriber | Markdown native |
| Ghost | Publishers, memberships | Flat fee | Full CMS included |
| beehiiv | Growth-focused | Freemium | Referral tools |
| Kit (formerly ConvertKit) | Creators | Per subscriber | Automation |
| Mailchimp | Small orgs | Tiered | Easy templates |

## Legal compliance

### CAN-SPAM requirements (US)

```markdown
- [ ] Accurate "From" name and email
- [ ] Non-deceptive subject line
- [ ] Physical postal address included
- [ ] Working unsubscribe mechanism
- [ ] Unsubscribe honored within 10 days
- [ ] No purchased lists
```

### GDPR requirements (EU subscribers)

```markdown
- [ ] Explicit consent obtained (not pre-checked)
- [ ] Clear privacy policy linked
- [ ] Easy unsubscribe process
- [ ] Data export available on request
- [ ] Data deletion on request
- [ ] Record of consent stored
```

## Related skills

- **web-scraping**, Automate content gathering for newsletters
- **data-journalism**, Include data visualizations in emails
- **academic-writing**, Write clear, structured content
- **newsroom-style**, AP Style enforcement on newsletter copy
- **fact-check-workflow**, Verify claims before they hit subscribers' inboxes
- **ai-writing-detox**, Strip AI patterns from drafts

---

## Skill metadata

| Field | Value |
|-------|-------|
| version | 1.0.0 |
| created | 2025-12-26 |
| updated | 2026-05-08 |
| author | Joe Amditis |
| domain | publishing, marketing |
| complexity | intermediate |