<?xml version='1.0'?>

<reference anchor='RFC1846'>

<front>
<title>SMTP 521 Reply Code</title>
<author initials='A.' surname='Durand' fullname='Alain Durand'>
<organization>Institut de Mathematiques Appliquees de Grenoble (IMAG)</organization>
<address>
<postal>
<street>BP 53 38041 Grenoble</street>
<street>CEDEX 9</street>
<region />
<code />
<country>FR</country></postal>
<phone>+33 76 635703</phone>
<facsimile>+33 76 446675</facsimile>
<email>Alain.Durand@imag.fr</email></address></author>
<author initials='F.' surname='Dupont' fullname='Francis Dupont'>
<organization>Institut National de Recherche en Informatique et en Automatique</organization>
<address>
<postal>
<street>B.P. 105 / 78153 Le Chesnay</street>
<street>CEDEX</street>
<region />
<code />
<country>FR</country></postal>
<phone>+33 1 39635213</phone>
<facsimile>+33 1 39635330</facsimile>
<email>Francis.Dupont@inria.fr</email></address></author>
<date month='September' year='1995' />
<abstract>
<t>This memo defines a new Simple Mail Transfer Protocol (SMTP)reply code, 521, which one may use to indicate that an Internet host does not accept incoming mail.</t></abstract></front>

<seriesInfo name='RFC' value='1846' />
</reference>
