<?xml version='1.0'?>

<reference anchor='RFC1427'>

<front>
<title abbrev='SMTP Size Declaration'>SMTP Service Extension for Message Size Declaration</title>
<author initials='J.' surname='Klensin' fullname='John Klensin'>
<organization>United Nations University</organization>
<address>
<postal>
<street>PO Box 500</street>
<street>Charles Street Station</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='K.' surname='Moore' fullname='Keith Moore'>
<organization>University of Tennessee, Computer Science Dept.</organization>
<address>
<postal>
<street>107 Ayres Hall</street>
<city>Knoxville</city>
<region>TN</region>
<code>37996-1301</code>
<country>US</country></postal>
<email>moore@cs.utk.edu</email></address></author>
<date month='February' year='1993' />
<abstract>
<t>This memo defines an extension to the SMTP service whereby an SMTP client and server may interact to give the server an opportunity to decline to accept a message (perhaps temporarily) based on the client's estimate of the message size.</t></abstract></front>

<seriesInfo name='RFC' value='1427' />
</reference>
