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SquirrelMail Folder Scan with ClamAV

Transferring Mail to IMAP You may have mail that you want to move to the new IMAP account you created with Postfix and Squirrelmail.  In this case create a directory, in the example OldMail has been created. The Postfix Training Manual has more information. If you move mail from a different account, or from another Outlook ...
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SquirrelMail Folders with Outlook

Outlook Express and SquirrelMail Folders The first problem that you may experience with Outlook Express or other email clients is that you have these multiple folders that seem to be duplicated.  The problem is that by default Squirrelmail places folders under the INBOX locations while Outlook and other clients will place them at a ...
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Thunderbird Secure Connections

Thunderbird Client Configuration Client configuration can be just as big of problem as the set up for the server.  One of the problems is that not all clients, both Linux and Windows, are capable of handling TLS or SMTP AUTH.  That is getting better but it is still a problem.  One great alternative client is Thunderbird, Icedove if ...
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Configure Microsoft Outlook Express

Configure Microsoft Outlook Express with TLS and SMTP_AUTH.  This is a common issue that can be overlooked by administrators for users who insist on using Outlook Express.  The set up for secure login and sending email is not intuitive. For more information on how to configure Postfix you can consider Postfix Self-Directed Course or ...
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Policy Banks with Amavis

Amavisd-new provides Policy Banks that allow you to manage messages based on the client or sender.  For example if you wanted senders to be able to send to email lists without using the server resources for scanning with Spamassassin and ClamAv for these outgoing messages you could create a Policy Bank Solution: Specify Clients Who Can Bypass Scanning This solution will allow the mail server to avoid the scanning process to save on system resources, ...
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Securing PostfixAdmin

Securing the PostfixAdmin Directory on Ubuntu Many administrators who use Postfixadmin, a web based tool to manage virtual domains on Postfix, would like to secure the transactions between the PostfixAdmin program and the administrator.  At the same time often you do not want to add the extra burden of SSL on the whole domain but just want to secure one directory.   The solution is to create a certificate for that one directory only and also locking ...
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Emergency: Cleaning the Active Queue

What do you do when you massive overload of unwanted mail that is coming to your server?  Recently I saw a Postfix Mail server that had gone down some months ago but had 10s of thousands of email ready to  be sent.  When it was repaired it began sending tons of old mail....mail that was simply not needed to send any longer. This is a ...
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Spamassassin Blacklists

Blacklists are a little easier to understand in that you will find domains or senders that you simply do not want to receive mail from them ever. There are two blacklist directives.  The first directive, blacklist_from will specify a a sender address that address is what will appear in the Resent-From, From, Envelope-Sender, Resent-Sender or X-Envelope-From. When the sender address matches a score of 100 is added to the sender, which effectively blocks ...
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