Free imap4 vs pop3 software for linux

Perl Pop3 is a POP3 server fully implemented in Perl.
The advantages over other POP3 servers are that it is not a memory hog, and can be used to connect to databases for authentication.
Also, its code is easy to extend for any other uses, like POP-before-SMTP and extended logging.
Main features:
- Does not read the mailbox into memory, it reads what it needs as it processes the mailbox, so its memory requirements are low.
- Most email delivery is just printing out to the client; this is done in a fast and efficient way.
- It uses the systems users in the default unix way, but it can be changed to read users off a database (using DBI/DBD). It is prepared to use the database right away and can be extended or configured to use existing systems.
- It can be use to solve the smtp authentication via popauth or relay-domains (with sendmail) so users can be permitted to send smtp mail after pop3 authentication. This has been an effective solution for roaming users.
- Logging can be extended beyond the use of text files to any other method available in Perl, including database systems.
- Also, security is not an issue, as input is strictly controlled.
Using an easily modifiable daemon as part of a e-mail solution can be of great advantage over other existing systems in other languages. Further development will also try to incorporate more easily configurable extensions and plugins, so rapid deployment and extensibility is achieved.
Installation:
For installation instructions and configuration please see the INSTALL file. For more detailed information, consult the DOC file.

GMail::IMAPD is an IMAP4 gateway to Googles webmail service.

SYNOPSIS

# Start an IMAP-to-Gmail daemon on port 1143

use GMail::IMAPD;

my $daemon=GMail::IMAPD->new(LocalPort=>1143,
LogFile=>gmail_imapd.log,
Debug=>1);
$daemon->run();

# Or if you prefer to use your own server socket,
# you can do something like:

my $i2g=GMail::IMAPD->new(LogFile=>imapd.log);

for(;;){
my $s=someserver();
$i2g->procimap($s);
}

This module allows users to access their Gmail account with an IMAP client by running a server which accepts IMAP connections.

libspopc is a simple and light pop3 mail client library used by small programs. One of the libspopcs purposes is to help developpers to host easily a pop3 mail client in their programs.

libspopc support also SSL encrypted connections (with libssl and libcrypt available at the openssl website), but it can also be built without SSL support if you prefer.

libspopc provides an easy to learn session interface, but provides also a classical socket-level interface for those who prefer to manage a socket rather than a session structure. I encourage you to use the session-level interface.

WMpop is a Window Maker DockApp for monitoring a local (mbox format) or POP3 mailbox. WMpop project displays:
- number of mails in the mailbox (or unread mails if checked in the preference screen),
- a scrolling text with the email address of the senders (only for local mailbox for the moment),
- and a status led, indicating mail checking progression and errors.
WMpop can be configured via a graphic interface written in GTK+. The configuration interface let you define parameters of your POP3 server, and let you personalize the app (changing icons or sound and choosing an external command to launch on demand).
It is internationalized, with French translation. You can also run several instances of the program of different mailboxes (remote or local).

Poprox is a POP3 and SMTP transparent filtering proxy. The project does virus scanning using libclamav and is comparable to p3scan in philosophy.

Its design is based on a multi-process architecture which allows the detection of libclamav crashes. When this occurs, Poprox is able to delete the offending mail.

Debug mode can be toggled by sending a SIGUSR1 signal to the main process. Interactions with users can be translated in any language by using a simple template system.

Twisted Mail project provides client and server implementations of SMTP, POP3, and IMAP4.
These differentiate themselves from the Python standard library implementations both by presenting a much higher-level, easy-to-use interface and in their server components, which allow the implementation of custom servers for each protocol without dealing with protocol-level issues.
Twisted Mail includes a simple demonstration email server which accepts messages over SMTP, stores them in a Maildir arrangement, and can serve them to clients over POP3.
Enhancements:
- The IMAP4 client now properly quotes usernames and passwords when necessary.
- It also handles unsolicited FLAGS responses.
- The IMAP4 server can now parse multiple literals in a single command and to FETCH requests with multiple BODY parts.
- A bug where Deferreds returned from IMAP4 client methods would not receive connection lost notification has been fixed.
- Startup time on OS X has been improved.
- The SMTP server has been sped up.
- The POP3 mailbox API has been expanded to allow Deferreds to be returned in some cases.

Balsa is a GNOME mail client with support for local mailboxes, POP3, and IMAP.
Balsa is a Gnome e-mail client supporting POP3, IMAP, and local mail delivery. Balsa can be compiled with multi-threading support for faster response, and can do nifty things like read your GnomeCard address book, use LDAP, and render HTML mail.
Main features:
- Support for local mailbox formats: mbox, maildir, mh
- Allows nested mailboxes (see this screenshot)
- Support for POP3 and IMAP mail access protocols
- Printing
- Spell Checking
- Multi-threaded mail retrevial (optional)
- MIME support (view images inline, save parts)
- Supports SMTP and/or use of local MTA, ie. Sendmail
- Address Book that integrates with GnomeCard
- Highly configurable
- Active, open development (see the mailing list page)
- Multiple character sets for composing and reading messages
- Allows file attachments to outgoing messages
- GPG/OpenPGP mail signing and encryption

pop3spam is a POP3 client which connects to a POP3 server and deletes unsolicited mail. If a message has been identified as unsolicited, it can be deleted directly from the POP3 server without the need to download it first.

Eventually your normal mail-retrieval utility (e.g. fetchmail) can gather all (cleaned) mail as usual. The program is intended for people with low bandwidth. Its very annoying if you first have to download lots of large messages just for the sole purpose of deleting them afterwards because your local spam filter debunked them as spam. Its also annoying to download very large messages (attachments) at all.

pop3spam doesnt use any hard wired regular expressions so it should basically work with any recent version. For information about the configuration and use of pop3spam, take a look at the man pages pop3spam(1) and pop3spamrc(5). A sample configuration file exists in the directory doc/ in the source tree.