There are several well-regarded sources in the field of email marketing. These include:
HubSpot: Known for its comprehensive resources on inbound marketing, HubSpot offers an extensive library of articles, guides, and templates focused on email marketing.
Mailchimp: As a leading email marketing service provider, Mailchimp's blog and resource center are rich with insights on best practices, strategies, and industry trends.
Litmus: Specializing in email design and analytics, Litmus provides a wealth of information on improving email deliverability, design, and performance.
Campaign Monitor: This platform offers detailed guides, case studies, and reports on various aspects of email marketing.
MarketingProfs: A go-to resource for marketing professionals, MarketingProfs covers a broad range of topics, including email marketing, with in-depth articles and webinars.