Our email hosting stack uses a suite of open source tools:
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Postfix is a popular mail transfer agent - it’s easy to use, flexible and includes support for Sendmail’s mail filters. We use Postfix.admin which provides an web based interface to configure and manage a Postfix based email server.
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Postfix.admin is an open source web based interface to configure and manage a Postfix based email server
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Roundcube is an IMAP web-based email client, providing MIME support, address book, folder manipulation, message searching and spell checking.
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Dovecot is a secure IMAP and POP3 email server. It plays well with Postfix and is extensible through the use of plugins.
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AMaViS is a content filter for email that implements mail message transfer, decoding, does some processing and checking, and interfaces with external content filters to provide protection against spam, viruses and other malware.
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ClamAV is antivirus software for detecting trojans, viruses, malware & other malicious threats.