While the tips provided apply to all the global travelers, the services mentioned in the Tip apply more to the US audience.
Put Vacation Hold on your Deliveries
Package delivery services like Fetch Package provide you with the option to set vacation hold.
Put Vacation Hold on Mail or Forward Mail
In the United States, USPS allows you to put your mail on hold for upto 30 Days. If you are out of city for more 30 days you can choose to forward mail.
USPS Vacation Hold Service: https://www.usps.com/manage/hold-mail.htm