by a laptop 12 b or a workstation 11 b and bruno has an e mail account fqda bruno bar com at the mail server 22 b and may connect to the internet 1 by a workstation 11 a or a mobile phone 13 a presently used email message transmission e g between hosts 12 b and 11 a usually takes place as illustrated in fig1 1 alice mua initiates connection 31 a through a router 25 b between alice laptop 12 b and alice mta 22 a as defined in her email account settings and delivers the message to server 22 a according to smtp sometimes an additional in between mail submission agent msa is used in transmission 31 a 2 server 22 a initiates a connection 31 b with bruno mta 22 b which it finds querying dns system for mx record for domain bar com of the bruno fqda bruno bar com and delivers the message to the server 22 b according to smtp sometimes an additional in between mail delivery agent mda is also used in transmission 31 b 3 the message may be downloaded from the server 22 b according to pop3 or imap protocols right after bruno mua initiates a connection with.