http://seo-ale.ru/poleznoe/it-[..]tp-server-exim4.html[link1] – ОТПРАВКА ПОЧТЫ ЧЕРЕЗ ВНЕШНИЙ SMTP СЕРВЕР. EXIM4

https://www.marcus-povey.co.uk[..]ng-starttls-in-exim/[link2] – Configuring STARTTLS in Exim
https://www.marcus-povey.co.uk[..]cates-the-right-way/[link3] – Self Signed Certificates the right way

Ссылки
[link1] http://seo-ale.ru/poleznoe/it-kurilka/otpravka-pochty-cherez-vneshnij-smtp-server-exim4.html

[link2] https://www.marcus-povey.co.uk/2015/04/16/configuring-starttls-in-exim/

[link3] https://www.marcus-povey.co.uk/2014/07/09/self-signed-certificates-the-right-way/