email in my website was working very well but it stop working. it shows email sent in my website but it does not reach its destination, i have no knowledge why? i did join droplet with domain name then i remove domain...

in my website, i have to send mail to other mailers where sent mail is going to gmail and yahoo. but it is not received by outlook mail. in other words, when i send mail to yahoo or gmail then it is received successfu...

i have made my website in PHP on local server like(NetBeans local server). may i make it live on DigitalOcean? and how?