Free diagnostic script reveals configuration issues, error patterns, and security risks. Instant HTML report.
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LetterIt is a Web-based mailing list manager that is simple to install and available in several languages. It can send messages to a mailing list via PHP Mail, sendmail, qmail, SMTP or pickup mode (only Windows) in HTML/Text or text format with attachment
A chkuser plugin for qmail with vpopmail and spp plugin.
This plugin will reject incomming mail if the given recieving address is not on the server. Works with smtp-auth, vpopmail, valias, ezmlm, .qmail-alias, aliasdomains and valias on aliasdomain.