There is no one-size-fits-all answer to this question as the best day and time to send out email marketing campaigns will depend on various factors, such as the target audience, the type of email being sent, and the industry in which your business operates.

The best day and time to send out your email marketing campaigns can vary depending on your audience and the specific goals of your campaign. However, there are some general guidelines you can follow to increase the likelihood of your emails being opened and read:

• Avoid sending emails during holidays and weekends: People are more likely to be away from their computers or smartphones during these times, so your emails may go unnoticed.
  
• Consider sending emails during weekdays: Tuesdays, Wednesdays, and Thursdays tend to be the best days for sending emails as people are less likely to be overwhelmed with work than on Mondays and Fridays.
  
• Time your emails appropriately: Generally, sending emails in the morning (between 9 am and 11 am) or in the afternoon (between 1 pm and 3 pm) can increase the chances of your emails being opened and read. However, it’s also worth considering your audience’s habits – if they tend to check their email in the evening, for example, sending an email then may be more effective.
  
• Use A/B testing to find the optimal time: Experiment with sending emails at different days and times to see what works best for your specific audience. This can help you refine your approach over time and increase the effectiveness of your email marketing campaigns.