Added the ability to specify an additional SMTP server for sending via the Database of e-mail addresses.

Added the ability to specify an additional SMTP server for sending via the Database of e-mail addresses. The collection of the database is carried out automatically and contains the e-mail addresses of all your customers, and can also be added manually. Access to the mailing list is free of charge, but you must send a request to enable access to the mailing function via the feedback form https://boostore.pro/feedback.html