Depending on the brand, email newsletters go out on a weekly, bi-weekly, or a monthly basis.

http://beehive.instructure.com/eportfolios/4908/Roliten_4Mg_Side_Effects_Meloxicam__Sun_Pharma__Urinary_Tract
http://eou.instructure.com/eportfolios/1747/Hepatitis_B_Test_Snacks__Jal_Innovations__ICare_Rapid_Test_Kits

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Newsletters are an essential part of the email marketing strategy, as they allow businesses to nurture their contacts by establishing themselves as key players in their industry, sharing insights and highlighting new products that will drive traffic to the website.