Free pop3 imap software for linux

POP3 Virus Scanner Proxy is a full-transparent proxy daemon which scans all mails for viruses using third party scanners (built-in support for AVPD and Trophie).

You have to set up a port redirection in the linux-netfilter (iptables) so that all connections from e.g. inside your office to any POP3 server outside in the world will not leave your router, but come a local port, on which POP3VScan listens. POP3VScan receives from the linux kernel the original destinations of packets (the POP3 server outside in the world) and will connect to them.

All data we receive from the client will be sent to the server, and vice versa. With a little enhancement: we parse the neccessary parts of the POP3 protocol and when an email is sent from the server, we store it into a file, invoke a virusscanner and send it if it is good, or we just replace it with a virus notification. It should be possible to use all scanners using the scannertype=basic. Also POP3VScan provides scannertype=avpd for high-speed scanning using Kaspersky Anti-Virus for Linux, every C programmer can easily adept other scan-daemons (trophie, sophie, antivir, ...).

Neither the client nor the server has to be configured, none of them will take notice that theres a mailscanner (except the client when he gets a virus notification or if he looks into the header, and the server gets our ip as source).

POP3Download provides a small Perl alternative to Fetchmail.
POP3Download is a simple Perl script which downloads and delivers email from a POP3 server to a local MTA or MDA.
It was developed in order to work around problems in Fetchmail while still providing the same or similar functionality.
pop3download is my initial work on a drop-in replacement for fetchmail, written in perl. it is designed to be a much more flexible and easy to edit app than the original fetchmail program as well as get around some design limitations and bugs.
there is limited support for fetchmail config files. $HOME/.fetchmailrc is parsed for the following options:
set daemon INTEGER
poll SERVER
user[name] USER
pass[word] PASS
proto[col] PROTO
mda ["]MDA["]
soon to be implemented options:
fetchall
keep
forcecr
without any arguments the config file is parsed and servers are polled.
if -h or --help is the first argument, some basic help options are displayed.
support for polling a single server on the command-line is available and will eventually be extended to support more fetchmail-like command line args.
currently pop3download only supports the pop3 protocol (as the name suggests) but adding support for IMAP and other protocols should be fairly trivial.
Enhancements:
- Added IMAP support, for mirroring/pulling an IMAP mailbox, for example to keep the size of the mailbox small.
- Fixed opening of UIDL id file; before it was using the same database for all users of a pop3 server, reusing the same UIDLs for each user.

Courier-IMAP is a fast, scalable, enterprise IMAP server that uses Maildirs. Many E-mail service providers use Courier-IMAP to easy handle hundreds of thousands of mail accounts.
With the built-in IMAP and POP3 aggregation proxy in Courier-IMAP 4.0, the only practical limit to Couriers horizontal scalability is available LAN bandwidth. In proxy mode, a pool of Courier servers receive IMAP and POP3 connections from clients, wait for the clients to send a login request, look up the mail accounts server, and establish a proxy connection to the actual server that hosts the mail account.
Please note that this IMAP server does NOT handle traditional mailbox files (/var/spool/mail, and derivatives), it was written and optimized for the specific purpose of providing IMAP access to Maildirs.
"Maildir" is a directory-based mail storage format originally introduced in the Qmail mail server, and adopted as an alternative mail storage format by both Exim and Postfix. Courier-IMAP is popular on Qmail/Exim/Postfix sites that are configured to use maildirs. The primary advantage of maildirs is that multiple applications can access the same Maildir simultaneously without requiring any kind of locking whatsoever. Maildir is a faster and more efficient way to store mail. It works particularly well over NFS, which has a long history of locking-related woes.
This is the same IMAP server thats included in the Courier mail server, but configured as a standalone IMAP server that can be used with other mail servers - such as Qmail, Exim, or Postfix - that deliver to maildirs. A Courier/Postfix combination is very popular. If you already have Courier installed, you do not need to download this version. If you install this version, you must remove it if you later install the entire Courier server. Its possible to have both versions installed, but this will require a delicate juggling act that youll have to learn on your own.
Enhancements:
- A bug in quota calculation on 64-bit platforms has been fixed.
- The IMAP server will try to log the clients bandwidth usage if the server process gets killed by a signal.
- New messages created by the IMAP server will use the servers umask setting.
- Many compiler warnings, error messages, and manual page typos were fixed.

squid-imap provides a piece of oftware to authenticate squid users via an IMAP server.

squid-imap is a basic squid auth helper that authenticates usernames and passwords via an IMAP server.

IMAP utils software contains a set of simple utilities for managing IMAP emails.
imap-purge
Purges old read and unread mails from folders.
imap-folders
Creates folders on IMAP.
imap-stats
Shows summary about unread and unseen mails.
Enhancements:
- Several new scripts for reading and storing messages were added.

Postaci (Turkish word for Postman) is a multiplatform PHP webmail software which is database independent, IMAP/POP3, multilanguage(32 languages) and fully MIME compatible. While using POP3 mode to fetch messages it uses database fields to simulate IMAP folders, on which you can save, move, delete,read e-mail.
It is a easy to set up, really secure environment and been downloaded by more than hundred thousand users all around the world. It also is bundled with a simple adressbook, a notebook, a bookmark manager application.
Postaci includes multidomain(virtual) support. Domains are stored in a DB table and all users must be linked to a domain. It can be done at tblDomains and tblUsers tables at the database. If you have a single domain on your server you won t need to do this. There must be at least one domain at the database and its index should be 1. This is the default domain for any user. You can change your default domain at the tblDomain.sql file at the queries folder.
Enhancements:
- SMTP authentication for those who need to authenticate to send email.
- An Email Address field in Preferences allows you to manually set your From: email address.
- A problem in moving messages when using IMAP has been fixed.

IMAP Proxy server is a caching IMAP proxy server. It was written to compensate for webmail clients that are unable to maintain persistent connections to an IMAP server. Most webmail clients need to log in to an IMAP server for nearly every single transaction.

This behaviour can cause tragic performance problems on the IMAP server. imapproxy tries to deal with this problem by leaving server connections open for a short time after a webmail client logs out.

When the webmail client connects again, imapproxy will determine if theres a cached connection available and reuse it if possible.

How does imapproxy keep track of which server connection is for which user?

Upon the first successful login to the real IMAP server (through the proxy), imapproxy fills in a little record that contains the username, an md5 digital signature of the password and the server socket descriptor thats being used.

After you log out and then log back in again, imapproxy just has to find a record that matches your username and password. These records are stored in a hash table (with the username being the hash key) in memory, so the lookups are pretty fast.

Can IMAP Proxy support multiple backend servers?

If you want IMAP Proxy to be able to proxy to multiple backend IMAP servers, you can run multiple instances of IMAP Proxy and make sure each instance is looking at a different configuration file.

Before you do this, take a look at perdition which appears to have been designed with this specific task in mind.

IMAP::Admin is a Perl module for basic IMAP server administration.

SYNOPSIS

use IMAP::Admin;

$imap = IMAP::Admin->new(Server => name.of.server.com,
Login => login_of_imap_administrator,
Password => password_of_imap_adminstrator,
Port => port# (143 is default),
Separator => ".", # default is a period
CRAM => 1, # off by default, can be 0,1,2
SSL => 1, # off by default
# and any of the SSL_ options from IO::Socket::SSL
);

$err = $imap->create("user.bob");
if ($err != 0) {
print "$imap->{Error}n";
}
if ($err != 0) {
print $imap->error;
}
$err = $imap->create("user.bob", "green");
$err = $imap->delete("user.bob");
$err = $imap->h_delete("user.bob");

$err = $imap->subscribe("user.bob");
$err = $imap->unsubscribe("user.bob");

$err = $imap->rename("bboard", "newbboard");

@quota = $imap->get_quotaroot("user.bob");
@quota = $imap->get_quota("user.bob");
$err = $imap->set_quota("user.bob", 10000);

@acl = $imap->get_acl("user.bob");
%acl = $imap->get_acl("user.bob");
$err = $imap->set_acl("user.bob", "admin", "lrswipdca", "joe", "lrs");
$err = $imap->delete_acl("user.bob", "joe", "admin");

@list = $imap->list("user.bob");
@list = $imap->list("user.b*");

$imap->{Capability} # this contains the Capabilities reply from the IMAP server

$imap->close; # close open imap connection

IMAP::Admin provides basic IMAP server adminstration. It provides functions for creating and deleting mailboxes and setting various information such as quotas and access rights.

Its interface should, in theory, work with any RFC compliant IMAP server, but I currently have only tested it against Carnegie Mellon Universitys Cyrus IMAP and Mirapoints IMAP servers. It does a CAPABILITY check for specific extensions to see if they are supported.

Operationally it opens a socket connection to the IMAP server and logs in with the supplied login and password. You then can call any of the functions to perform their associated operation.

Separator on the new call is the hiearchical separator used by the imap server. It is defaulted to a period ("/" might be another popular one).

CRAM on the new call will attempt to use CRAM-MD5 as the login type of choice. A value of 0 means off, 1 means on, 2 means on with fallback to login. *Note* this options requires these perl modules: Digest::MD5, Digest::HMAC, MIME::Base64

SSL on the new call will attempt to make an SSL connection to the imap server. It does not fallback to a regular connection if it fails. It is off by default. IO::Socket::SSL requires a ca certificate, a client certificate, and a client private key. By default these are in current_directory/certs, respectively named ca-cert.pem, client-cert.pem, and client-key.pem. The location of this can be overridden by setting SSL_ca_file, SSL_cert_file, and SSL_key_file (youll probably want to also set SSL_ca_path).

I generated my ca cert and ca key with openssl: openssl req -x509 -newkey rsa:1024 -keyout ca-key.pem -out ca-cert.pem
I generated my client key and cert with openssl: openssl req -new -newkey rsa:1024 -keyout client-key.pem -out req.pem -nodes openssl x509 -CA ca-cert.pem -CAkey ca-key.pem -req -in req.pem -out client-cert.pem -addtrust clientAuth -days 600

Setting up SSL Cyrus IMAP v 2.x (completely unofficial, but it worked for me) add these to your /etc/imapd.conf (remember to change /usr/local/cyrus/tls to wherever yours is) tls_ca_path: /usr/local/cyrus/tls tls_ca_file: /usr/local/cyrus/tls/ca-cert.pem tls_key_file: /usr/local/cyrus/tls/serv-key.pem tls_cert_file: /usr/local/cyrus/tls/serv-cert.pem
For my server key I used a self signed certificate: openssl req -x509 -newkey rsa:1024 -keyout serv-key.pem -out serv-cert.pem -nodes -extensions usr_cert (in openssl.cnf I have nsCertType set to server)
I also added this to my /etc/cyrus.conf, it shouldnt strictly be necessary as clients that are RFC2595 compliant can issue a STARTTLS to initiate the secure layer, but currently IMAP::Admin doesnt issue this command (in SERVICES section): imap2 cmd="imapd -s" listen="simap" prefork=0
where simap in /etc/services is: simap 993/tcp # IMAP over SSL