The header filters allow you to selectively filter out mail messages based on the contents of their headers. Basically, all the options correspond to different email headers. Email headers are added to a message by the sending email software, and most of them are visible only when you view the email message source.You can choose between the following actions to take place in case the chosen header filter matches: Junk mail: The message will be saved in the Junk Mail folder if it is enabled. If the Junk Mail folder is disabled, this action is the same as "Drop mail if". Drop mail: In this case, the message will be deleted. Move mail: In this case, the message will be moved to chosen folder. Forward mail: In this case, the message will be forwarded to the specified email address(es). You can enter up to five email addresses in the field, separated by a comma.In all of the above cases, the sender is not notified of the taken action. The Subject header contains the subject of the message. If you want to ban all messages that contain “viagra" in the subject, just select this option and type "viagra" (without the quotation marks) in the text box. The From header contains the sender name and email address. The To header contains the recipient email address. This would be normally your email address. The CC header contains the other email addresses your message has been sent to. CC stands for "Carbon Copy", which is used in most email clients for this purpose. The Received header is actually added by the mail server, and contains the IP address of the sender. If you want to block all messages from a given IP address, use this option. The X-Spam-Level header is added by SpamAssassin – an email scanning software that can add this header to messages it has scanned. If you are using some third party filtering services (SpamCop.net for example) you can take advantage of this setting. If you decide to use our SpamAssassin, this header will not be added to your messages. The X-Mailer header identifies the email client used to send the email message. For example, if you select this option and type "Outlook" (without the quotation marks), you will ban all incoming messages that have been sent through MS Outlook and Outlook Express. The X-Mailscanner header is added by an anti-virus software such as Mailscanner. We have added it upon user request because a particular virus was adding this header to all incoming messages, and banning messages with this header would ban all such viruses. However, it might also ban messages that have been scanned by Mailscanner, so we do not recommend using this option. The Content-type header says what is the structure of the incoming mail message - it could be plain text, HTML, MIME encoded, etc.
The Attachment filter can block messages depending on their attachment. You can either block messages with a given type of attachment, or block messages with any attachment. Attachment types are combined in several different categories - archive file, image file, video file, audio file, document file, PDF file. In the table below, you can check what file types are included in each category:
Archive file
7z, 7zip, 7zip2, ace, alz, arc, arj, ark, bz2, bzip, bzip2, cab, gz, gz2, gzip, gzip2, iso, lz, lzh, lzma, lzo, lzx, rar, rz2, sea, sfx, sqx, tar, tgz, xz, xz2, zip, zip2, zipx, apk, img, vhdx, vhd
Image file
bmp, exif, gif, jfif, jpe, jpeg, png, tif, tiff, pcx, svg
Audio file
aac, flac, m4a, m4p, mp3, ogg, wav, wma, ra
Video file
3gp, asf, asx, avi, flc, flv, flx, h264, m4e, m4v, mkv, mp4, mpeg, mpeg(1-9), mpg, ogm, ogv, ogx, rm, vob, webm, wmv, xvid, divx
Document file
csv, doc, docx, epub, xhtml, html, htm, log, ppt, pptx, txt, xls, xlsx, xml, ods, odt
PDF file
pdf
Executable file
bat, bin, cmd, com, cpl, deb, dll, elf, exe, gadget, hta, inf, jar, js, jse, msc, msh, msi, msp, pif, ps1, reg, rpm, scf, scr, sh, so, sys, vb, vbe, vbs, ws, wsc, wsf, wsh
You can also create a default filter for each mailbox. It allows you to have a filter that triggers when no other filter for the mailbox matches. Please note that if you add a default local filter for the mailbox, none of the global filters will be processed for that mailbox.
Please note that using header filters requires some general knowledge of how the email system works.
Wildcards are not supported when adding a header filter.