I have a query about SMTP. At the movement I am thinking that SMTP is only required to send mail from client to server or server to server. but some one told me that SMTP is also required when I send a mail e.g From: [email protected] To: [email protected]
In this case he told me that at yahoo.com SMTP is responssible to recieve mail from hotmail.com too then client can see this mail via POP.
So I wanna know who is responsible for recieve mail at server level. If I install a mail server for azfar.com and add its MX record to DNS and then stop my SMTP service then can my server recieve mails from other or not.