Channel-specific marketing refers to leveraging various communication channels to reach and engage with your target audience. Here are some insights into email marketing, SMS marketing, WhatsApp marketing, and Messenger marketing, along with best practices and tips for building a sizable list of subscribers:

1. Email Marketing:
   • Best Practices:
     • Use double opt-in: Require subscribers to confirm their email addresses to ensure a high-quality and engaged list.
     • Personalize emails: Address subscribers by their names and tailor the content based on their preferences.
     • Segment your list: Divide subscribers into groups based on demographics, interests, or purchase history to deliver relevant content.
     • Use engaging subject lines: Craft compelling subject lines that entice recipients to open your emails.
     • Optimize for mobile: Ensure your emails are mobile-friendly and display correctly on different devices.
     • Test and analyze: Experiment with different email elements (subject lines, content, layout) and analyze open rates, click-through rates, and conversions to optimize your campaigns.
   • Things to Avoid:
     • Purchasing email lists: Avoid buying email lists, as the quality and engagement of those contacts are typically low, and it can harm your reputation as a sender.
     • Over-emailing: Bombarding subscribers with excessive emails can lead to unsubscribes or being marked as spam.
2. SMS Marketing:
   • Best Practices:
     • Obtain permission: Ensure you have explicit consent from subscribers before sending SMS messages to comply with relevant regulations.
     • Keep messages concise: SMS has character limitations, so be brief and convey the most important information.
     • Time your messages: Send SMS during appropriate hours to avoid inconveniencing recipients.
     • Provide opt-out instructions: Include clear instructions for subscribers to opt out of receiving further SMS messages.
   • Things to Avoid:
     • Sending unsolicited messages: Similar to email marketing, only send SMS to individuals who have opted in to receive them.
     • Overuse of abbreviations: While space is limited, excessive use of abbreviations and acronyms can make your messages difficult to understand.
3. WhatsApp Marketing:
   • Best Practices:
     • Obtain permission: Just like with SMS, ensure you have consent from users before sending marketing messages via WhatsApp.
     • Use the WhatsApp Business API: Utilize the official WhatsApp Business API to send messages at scale and access advanced features.
     • Leverage multimedia content: Take advantage of WhatsApp’s multimedia capabilities by sending images, videos, or audio messages.
     • Provide value-added content: Offer exclusive promotions, personalized recommendations, or customer support through WhatsApp.
   • Things to Avoid:
     • Spamming users: Respect users’ privacy and only send relevant and valuable messages.
     • Violating WhatsApp’s policies: Familiarize yourself with WhatsApp’s terms of service and policies to avoid any violations.
4. Messenger Marketing (Facebook Messenger):
   • Best Practices:
     • Utilize chatbots: Use chatbot platforms to automate conversations and provide instant responses to user inquiries.
     • Segment and personalize messages: Leverage user data to send targeted and personalized messages based on preferences and behaviors.
     • Implement conversational flows: Design interactive and engaging conversational experiences to drive user engagement.
   • Things to Avoid:
     • Being overly promotional: Strike a balance between promotional content and helpful, interactive conversations.
     • Ignoring opt-out requests: Honor users’ requests to unsubscribe from further messages promptly.

Building a sizable list of subscribers:

• Use lead magnets: Offer valuable incentives like e-books, guides, or exclusive content to encourage visitors to subscribe.
• Optimize subscription forms: Make your subscription forms prominent, easy to fill out, and highlight the benefits of subscribing.
• Leverage social media: Promote your email/SMS/WhatsApp/Messenger campaigns on social media to attract more subscribers.
• Run contests or giveaways: Encourage participation by offering prizes or exclusive offers in exchange for email/SMS/WhatsApp/Messenger subscriptions.
• Provide valuable content: Deliver high-quality content through your marketing channels to keep subscribers engaged and encourage them to refer others.
• Use pop-ups or exit-intent technology: Utilize these tools to capture visitors’ attention and prompt them to subscribe before leaving your website.
• Leverage partnerships: Collaborate with complementary businesses or influencers to reach new audiences and gain subscribers.

Remember, always prioritize permission-based marketing and focus on delivering value to your subscribers through relevant and engaging content.

Also, from another source:

Here are some channel-specific marketing best practices and things to avoid, as well as how to build a sizeable list of subscribers for each channel:

Email marketing

• Best practices:
  • Segment your list so you can send targeted messages to different groups of subscribers.
  • Personalize your emails as much as possible.
  • Use clear and concise subject lines that will make people want to open your emails.
  • Write engaging and informative email content.
  • Offer valuable incentives for subscribers to take action, such as discounts, free trials, or exclusive content.
  • Track your email marketing results so you can see what’s working and what’s not.
• Things to avoid:
  • Sending too many emails.
  • Sending irrelevant emails.
  • Using spammy or deceptive subject lines.
  • Sending emails with attachments that are too large or contain viruses.
  • Not tracking your email marketing results.

SMS marketing

• Best practices:
  • Keep your SMS messages short and to the point.
  • Use clear and concise language.
  • Personalize your SMS messages as much as possible.
  • Offer valuable incentives for subscribers to take action, such as discounts, free trials, or exclusive content.
  • Track your SMS marketing results so you can see what’s working and what’s not.
• Things to avoid:
  • Sending too many SMS messages.
  • Sending irrelevant SMS messages.
  • Using spammy or deceptive subject lines.
  • Sending SMS messages with attachments that are too large or contain viruses.
  • Not tracking your SMS marketing results.

WhatsApp marketing

• Best practices:
  • Use WhatsApp’s rich media features to engage your audience, such as images, videos, and GIFs.
  • Create polls and surveys to get feedback from your subscribers.
  • Use WhatsApp’s analytics features to track your results and see what’s working and what’s not.
• Things to avoid:
  • Sending too many WhatsApp messages.
  • Sending irrelevant WhatsApp messages.
  • Using spammy or deceptive subject lines.
  • Sending WhatsApp messages with attachments that are too large or contain viruses.
  • Not tracking your WhatsApp marketing results.

Messenger marketing

• Best practices:
  • Use Messenger’s chatbot features to automate your marketing and customer service.
  • Create Messenger campaigns to promote your products or services.
  • Use Messenger’s analytics features to track your results and see what’s working and what’s not.
• Things to avoid:
  • Sending too many Messenger messages.
  • Sending irrelevant Messenger messages.
  • Using spammy or deceptive subject lines.
  • Sending Messenger messages with attachments that are too large or contain viruses.
  • Not tracking your Messenger marketing results.

How to build a sizeable list of subscribers:

• Offer something valuable in exchange for people’s email addresses, such as a free ebook, white paper, or discount code.
• Promote your email list signup form on your website, social media pages, and in your offline marketing materials.
• Run email marketing campaigns that offer valuable content and incentives to encourage people to subscribe.
• Partner with other businesses to cross-promote your email lists.
• Use email marketing automation tools to help you grow your list more efficiently.

By following these best practices and avoiding common pitfalls, you can use channel-specific marketing to reach your target audience and grow your business.