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Contents : ZMailer -- A Different Kind of MTA Z Z M A I LER matti.aarnio@sonera.fi ! " 1 # ZMailer -- A Different Kind of MTA A presentation of ZMailer for FUUG at SEA 2000 conference FUUG Finnish Unix User Group SEA The baltic sea cruising from Helsinki to Stockholm and back Matti Aarnio 15-Sep-2000 The overlays and notes are supplementary material which supports the mainline slides. (Page numbers at low right corner have a hyphen in them.) Note: When viewing this with XPDF (0.90 or 0.91) few TEX fonts will be invisible. Adobe AcroReader 4.0 is able to show those fonts. (Mainly these are less-than and greater-than glyphs around email addresses in baseline text.) matti.aarnio@sonera.fi ! " 1-a # A bit of History $% &'() 0 was created at University of Toronto around 1986 by Mr. Rayan Zachariassen (hence the "Z" in the name.) Back then the king of the hillock was (and still is) sendmail(8) but it was troubled with lots and lots of security problems. The sendmail(8) is also a resource consumption pig having same process do message collection and its final delivery may make sense in low-load environments but with high volumes use of queues is a must. matti.aarnio@sonera.fi ! " 2 # A bit more of History Rayan went to private sector around 1992 and ZMailer development was essentially abandoned by him. Since then yours truly has been hacking at it developing all kinds of extensions for modern Internet email. matti.aarnio@sonera.fi ! " 3 # Introduction to the Terminology In the 1970'es the Institute for Federal Information Processing defined terminology for then a new thing: email. The terminology was made more popular by X.400 standard from 1984. MTA: Mail Transfer Agent program to move mail from one system to other. MDA/LDA: A latter addition Message/Local Delivery Agent program (subsystem) doing delivery to local message store/driving program agents/whatnot. MS: Message Store Standard UNIX mailbox or something way more complicated like a database. MUA: Mail User Agent program which user uses to pick their email from the MS read them compose email and submit to the care of the MTA. UA: A generic X.400 term for the User Agent basically software entity acting on message content usually driven directly by the MTA without the message ever going via MS. (E.g. quite unlike MTA compare with vacation(1)) matti.aarnio@sonera.fi ! " 4 #

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