SendX allows you to optimize your broadcast campaigns according to your contacts' time zone with just a few clicks. You can then send them that email according to their time zone, no matter where they are in the world.
Note that you need to be a Business Plan Subscriber of SendX to be able to use these features.
Create a new campaign, or edit an already scheduled one (depending on the campaign you want to optimize)
Go to the Basic tab, and scroll down till you see the check box labeled Optimize my campaign performance. Check that box.
Make sure the box next to Send in contact's timezone is checked. Now, your campaign email will be sent to the contact according to his timezone. So if you have scheduled the time for the email as 3:45 PM EST, and few of your contacts are situated in the timezone GMT. Then the email to those contacts will be sent at 3:45 PM GMT. This can be extremely useful if you want a maximum open rate and your contacts are situated in different parts of the world.
Under the Preferred Timezone field, you can set the time zone for the contacts whose time zone is unknown. So if a particular contact has not given his location or you're not able to tell his timezone, this field's timezone will be the time when the emails are sent to those customers.
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And that's it! With just a few clicks you can optimize your email campaigns based on time zone!