Svakako pročitati za početak:

http://webdesign.tutsplus.com/tutorials/what-you-should-know-about-html-email–webdesign-12908

Pa onda ovo:

http://webdesign.tutsplus.com/articles/build-an-html-email-template-from-scratch–webdesign-12770

I na kraju – responzivni email template:

http://webdesign.tutsplus.com/articles/creating-a-simple-responsive-html-email–webdesign-12978

Slijedi nekoliko bespaltnih email template-a iz članka http://designscrazed.org/best-responsive-html-email-templates/:

https://www.emailonacid.com/blog/article/email-development/emailology_a_free_responsive_email_template_using_media_queries_-_part_i/

https://pixelbuddha.net/freebie/green-village-template

http://internations.github.io/antwort/

Za kraj evo i mog (kojem se ne prikazuje background-image u Outlooku:

Boyrecog email template for sharing results

I jedan modificirani da se ti problemi izbjegnu

Boyrecog email template for sharing results – bez backgorund-image osim u body-ju

Za rješavanje problema sa background-image u Outlook-u proučiti ove linkove:

https://www.campaignmonitor.com/blog/email-marketing/2010/12/updated-applying-a-background-image-to-html-email/

https://www.campaignmonitor.com/blog/email-marketing/2010/06/adding-background-images-to-your-email-in-two-simple-steps/

http://stackoverflow.com/questions/12970143/how-make-background-image-on-newsletter-in-outlook