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Internet Week > E-Mail Marketing > The Best Times To Send Marketing E-Mails > August 26, 2004: "Based upon the results of their research, Return Path recommends the following guidelines to improve deliverability rates of permission-based e-mail marketing campaigns:
Send e-mails on weekdays rather than weekends.
Send e-mails on weekdays between 6 a.m. and 10 a.m. EST.
Send e-mails on the following days (in descending order of delivery success): Monday, Tuesday, Thursday, and Wednesday. "