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6 <title>Fetchmail Feature List</title>
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25 <h1 class="c1">Fetchmail Feature List</h1>
30 <li>STARTTLS is supported in both POP and IMAP.</li>
32 <li>ESMTP AUTH (RFC 2554) is supported.</li>
34 <li>Has the capability of adding trace information to the Received
35 header to faciliate mail filtering by mailserver and remote
38 <li>Fetchmail now has options to handle SSL certificate
41 <li>Fetchmail can be told to fall back to delivering via local
42 sendmail if it can't open port 25.</li>
44 <li>Support for AUTH=CRAM-MD5 under POP3, a la RFC2195.</li>
46 <li>Support for ODMR (On-Demand Mail Relay), RFC 2645.</li>
48 <li>It's now easy to deliver mail to a local LMTP socket.</li>
50 <li>The interface option now checks both local and remote interface
53 <li>The plugin facility has been enhanced; %h and %p options are
54 now available to pass in the hostname and service port number.</li>
56 <li>Added a dropdelivered option to discard Delivered-To headers.
57 This addresses a problem with using fetchmail and postfix as a
58 relay inside a domain; when postfix sees incoming messages with
59 delivered-to headers looking exactly the same as the ones it adds
60 himself, it bounces the message.</li>
62 <li>Added --smtpname to set username and domain portion of SMTP
63 "RCPT TO" command. <fetchmail@mail.julianhaight.com>.</li>
65 <li>Added "from" server's IP address to inserted Received line
66 <fetchmail@mail.julianhaight.com>.</li>
68 <li>Fetchmail now runs on BeOS, thanks to David Reid
69 <david@jetnet.co.uk>.</li>
71 <li>In IMAP, unseen-message counting and indexing is now done by
72 SEARCH UNSEEN at the beginning of each poll or re-poll (rather than
73 with the UNSEEN and RECENT responses and FLAGS queries on
74 individual messages). This significantly cuts down on traffic to
75 and from the server, and gives more reliable results.</li>
77 <li>The aka option now matches hostname suffixes, so (for example)
78 saying `aka netaxs.com' will match not just netaxs.com but also
79 (say) pop3.netaxs.com and mail.netaxs.com.</li>
81 <li>Fetchmail can optionally use the RFC 2177 IDLE extension on an
82 IMAP server that supports it. On IMAP servers that don't, it can
83 simulate it using periodic NOOP commands.</li>
85 <li>Fetchmail now recognizes the RFC 2449 extended responses
86 [IN-USE] and [LOGIN-DELAY].</li>
88 <li>Fetchmail running in daemon mode now restarts itself quietly
89 when the rc file is touched.</li>
91 <li>Following recent court decisions and changes in U.S. federal
92 regulatory policy, hooks for Secure Sockets Layer (SSL) are now
93 part of the main fetchmail distribution. The distribution still
94 contains no actual cryptographic code.</li>
96 <li>NTLM support under IMAP, so fetchmail can query Microsoft
97 Exchange servers.</li>
99 <li>Expunge option can now be used to break POP3 retrieval into
102 <li>Support for AUTH=CRAM-MD5 under IMAP, a la RFC2195.</li>
108 <li>The interface and monitor options now work with freeBSD.</li>
110 <li>Fetchmail now sends RFC1894-conformant bouncemail on SMTP and
113 <li>Full support for LMTP according to RFC2033.</li>
115 <li>True multi-language support using GNU gettext.</li>
117 <li>Support for use of HESIOD with Kerberos.</li>
119 <li>The --bsmtp option supports recording fetched mail as a BSMTP
122 <li>The --limit option can now be used in daemon mode, with
123 oversized-message notifications being mailed to the calling
126 <li>Configurable support for the <a
127 href="http://www.demon.net/helpdesk/producthelp/mail/sdps-tech.html/">
128 SDPS extensions</a> in <a
129 href="http://www.demon.net/">www.demon.net</a>'s POP3 service.</li>
131 <li>There is now an interactive GUI fetchmail configurator,
134 <li>Code is 64-bit clean and Y2K-safe.</li>
136 <li>Automatically decodes armored 7-bit MIME into 8 bits (this can
139 <li>You can specify which SMTP error is recognized as a spam
142 <li>Support for Kerberos V authentication.</li>
144 <li>Support for IMAP-OTP authentication using Craig Metz's patches
147 <li>Support for IPv6</li>
149 <li>Support for IMAP with RFC1731-conformant GSSAPI
152 <li>Fixed and verified support for Cyrus IMAP server, M$ Exchange,
153 and Post Office/NT.</li>
155 <li>Support for responding with a one-time password when a POP3
156 server issues an RFC1938-conforming OTP challenge.</li>
158 <li>Support for Compuserve's RPA authentication protocol for POP3
159 (not compiled in by default, but configurable).</li>
165 <li>Support for IMAP RFC 1731 authentication with Kerberos v4.</li>
167 <li>Support for multiple-folder retrieval in a single session under
170 <li>Following SMTP 571 response to a From line, fetchmail no longer
171 downloads the bodies of spam messages.</li>
173 <li>Support for a `hunt list' of SMTP hosts.</li>
175 <li>Support for ESMTP 8BITMIME and SIZE options.</li>
177 <li>Support for ESMTP ETRN command.</li>
179 <li>The stripcr & forcecr options to explicitly control
180 carriage-return stripping and LF->CRLF mapping before mail
187 <li>Support for secure use with ssh.</li>
189 <li>Mailserver passwords can be parsed out of your .netrc
192 <li>When forwarding mail via SMTP, fetchmail respects the 571 "spam
193 filter" response and discards any mail that triggers it.</li>
195 <li>Transaction and error logging may optionally be done via
198 <li>(Linux only) Security option to permit fetchmail to poll a host
199 only when a point-to-point link to a particular IP address is
202 <li>RPOP support (restored; had been removed in 1.8).</li>
205 <h2>2.0 and earlier versions:</h2>
208 <li>Support POP2, APOP, RPOP, IMAP2, IMAP2bis, IMAP3, IMAP4,
211 <li>Support for Kerberos V4 user authentication (either MIT or
214 <li>Host is auto-probed for a working server if no protocol is
215 specified for the connection. Thus you don't need to know what
216 servers are running on your mail host in advance; the verbose
217 option will tell you which one succeeds.</li>
219 <li>Delivery via SMTP to the client machine's port 25. This means
220 the retrieved mail automatically goes to the system default MDA as
221 if it were normal sender-initiated SMTP mail.</li>
223 <li>Configurable timeout to detect if server connection is
226 <li>Support for retrieving and forwarding from multi-drop mailboxes
227 that is guaranteed not to cause mail loops.</li>
229 <li>Large user community -- fetchmail has a large user base (the
230 author's beta list includes well over two hundred people). This
231 means feedback is rapid, bugs get found and fixed rapidly.</li>
233 <li>Carefully written, comprehensive and up-to-date man page
234 describing not only modes of operation but also how to diagnose the
235 most common kinds of problems and what to do about deficient
238 <li>Rugged, simple, and well-tested code -- the author relies on it
239 every day and it has never lost mail, not even in experimental
240 versions. (In the project's entire history there has only been one
241 recorded instance of lost mail, and that was due to a quirk in some
242 Microsoft code.)</li>
244 <li>Strict conformance to relevant RFCs and good debugging options.
245 You could use fetchmail to test and debug server
246 implementatations.</li>
248 <li>For anybody who cares, fetchmail is Y2K safe.</li>
251 <h2>Features in common with other remote-mail retrieval
254 The other programs I have checked include fetchpop1.9,
255 PopTart-0.9.3, get-mail, gwpop, pimp-1.0, pop-perl5-1.2, popc,
256 popmail-1.6 and upop.
259 <li>Support for POP3.</li>
261 <li>Easy control via command line or free-format run control
264 <li>Daemon mode -- fetchmail can be run in background to poll one
265 or more hosts at a specified interval.</li>
267 <li>From:, To:, Cc:, and Reply-To: headers are rewritten so that
268 usernames relative to the fetchmail host become fully-qualified
269 Internet addresses. This enables replies to work correctly. (Would
270 be unique to fetchmail if I hadn't added it to fetchpop.)</li>
272 <li>Message and header processing are 8-bit clean.</li>
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279 <td width="30%" align="right">$Date$</td>
284 <address>Eric S. Raymond <a href="mailto:esr@thyrsus.com"><esr@snark.thyrsus.com></a></address>