时间：2007-02-14 来源：ffjnfj
MUA(Mail User Agent, mutt/outlook)
-(SMTP)-> MTA(Mail Transfer Agent, sendmail/postfix)
-(SMTP)-> ... (Pull Mail server)
-(SMTP)-> MTA(Pull/Push Mail server)
-> MDA(Mail Delivery Agent, procmail, run filters -> mail delivery)
MDA is a process on MTA
<-(pop/imap)- client PC
-(SMTP)-> MTA(Mail Transfer Agent, sendmail/postfix)
-(SMTP)-> ... (Pull Mail server)
-(SMTP)-> MTA(Pull/Push Mail server)
-> MDA(Mail Delivery Agent, procmail, run filters -> mail delivery)
MDA is a process on MTA
<-(pop/imap)- client PC
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