How to set up sending mail (SMTP) from the site?

Question

Mail server

Hi all!
There is a remote server with a dedicated IP address, web applications and a website on it, and that's it.
Installed Postfix, but no configuration yet.
Please tell me how to set up sending mail from the site (example: SITE.RU) to those password recovery support (from the form, the recipient's mail on another domain, for example: SUPPORT.RU), so as not to resolve and configure everything else on this domain (SITE.RU). Using mailer.php does not work. Hope I explained it well?

Answer 1

You can try using a third-party mail service for mailing, such as Yandex.
1. We connect the "Mail for Domain"
service blog.it-kb.ru/2016/02/03/delegating-dns-domain-to-...
2. We configure the site to send mail through an external Yandex mailer (using CMS as an example)
blog.it-kb.ru/2016/02/03/send-mail-from-blog-wordp...