The Welcome automation sends an email to your subscribers every time a contact is added to the specified list you choose.
You can design a welcome email template describing your company or an introduction to your business to guide the customer through your products and services.
You insert the campaign name, the from address, and the Email template design as you would do in a regular campaign.
For the recipients part you have to decide if the email will be sent to all the recipients already present in that list and every new contact added or you can decide that the automation will be sent only to the new contacts added (new subscribers) by switching on or off the send only to first-time subscribers switch (see picture above).
See How To Set Up Campaign Recipients for the recipients section.
After that you get to the Timing section.
On the timing section of the Welcome Email Automation you have to select the Week days checkbox to specify in which days this automation will be running.
On the selected day you have the possibility to either select a specified time lapse when the emails will be sent or you can specify the time lapse to be a full 24 hours.
By selecting the full day timeline the email is sent immediately after the contact is added to your list, if you select a specified time then the email will be sent only at that particular time (see picture above).
Then set up your desired time zone and as in regular campaigns you can turn on google analytics if you want to.