People are not really interested in purchasing stuffs all through out the year. Most of them have an inclination to buy different products during the holidays and festivals. If you have a good mailing list ready with you then try sending the emails to them and let them know about the latest products and good festival discounts if any. If this is a product which is required for official usage then the best time to send the emails is during the week. If this is something that needs to be discussed with the family and required for domestic usage then send promotional mails on Sundays and holidays to get best results.

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