<?xml version='1.0'?>

<reference anchor='RFC1425'>

<front>
<title>SMTP Service Extensions</title>
<author initials='J.' surname='Klensin' fullname='John Klensin'>
<organization>United Nations University</organization>
<address>
<postal>
<street>Charles Street Station</street>
<street>PO Box 500</street>
<city>Boston</city>
<region>MA</region>
<code>02114-0500</code>
<country>US</country></postal>
<phone>+1 617 227 8747</phone>
<facsimile>+1 617 491 6266</facsimile>
<email>klensin@infoods.unu.edu</email></address></author>
<author initials='N.' surname='Freed' fullname='Ned Freed'>
<organization>Innosoft International, Inc.</organization>
<address>
<postal>
<street>250 West First Street</street>
<street>Suite 240</street>
<city>Claremont</city>
<region>CA</region>
<code>91711</code>
<country>US</country></postal>
<phone>+1 909 624 7907</phone>
<facsimile>+1 909 621 5319</facsimile>
<email>ned@innosoft.com</email></address></author>
<author initials='M.T.' surname='Rose' fullname='Marshall T. Rose'>
<organization>Dover Beach Consulting, Inc.</organization>
<address>
<postal>
<street>420 Whisman Court</street>
<city>Mountain View</city>
<region>CA</region>
<code>94043-2186</code>
<country>US</country></postal>
<phone>+1 415 968 1052</phone>
<facsimile>+1 415 968 2510</facsimile>
<email>mrose@dbc.mtview.ca.us</email></address></author>
<author initials='E.' surname='Stefferud' fullname='Einar A. Stefferud'>
<organization>Network Management Associates, Inc.</organization>
<address>
<postal>
<street>17301 Drey Lane</street>
<city>Huntington Beach</city>
<region>CA</region>
<code>92647-5615</code>
<country>US</country></postal>
<phone>+1 714 842 3711</phone>
<facsimile>+1 714 848 2091</facsimile>
<email>stef@nma.com</email></address></author>
<author initials='D.H.' surname='Crocker' fullname='David H. Crocker'>
<organization>The Branch Office</organization>
<address>
<postal>
<street>675 Spruce Drive</street>
<city>Sunnyvale</city>
<region>CA</region>
<code>94086</code>
<country>US</country></postal>
<email>dcrocker@mordor.stanford.edu</email></address></author>
<date month='February' year='1993' />
<abstract>
<t>This memo defines a framework for extending the SMTP service by defining a means whereby a server SMTP can inform a client SMTP as to the service extensions it supports. Standard extensions to the SMTP service are registered with the Internet Assigned Numbers Authority (IANA).  This framework does not require modification of existing SMTP clients or servers unless the features of the service extensions are to be requested or provided.</t></abstract></front>

<seriesInfo name='RFC' value='1425' />
</reference>
