Attachment extraction

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This feature allows surgemail to extract large attachments from email messages and store them on the built in web server, it replaces the attachment with a link in the original email message so the destination user can download the attachment (if they want it).

The attachments are then stored for a period of time, based on if the message was sent or received (adjustable per user/domain/global)

To enable the feature set:

       g_att_enable "true"

Then you will want to specify system defaults. If you want the feature turned off by default then DO NOT set the system defaults!

g_att_send “True” # Enable globally by default when sending msgs
g_att_in “True” # Enable globally when receiving msgs

Specify the default time to keep messages!

g_att_send_keep “90” # Set default time to keep sent attachments (days)
g_att_in_keep “2000” # Days to keep incoming attachments (days)

Other OPTIONAL system defaults to configure…

g_att_path   # Path to store attachments, default is 'att' sub folder
g_att_min "100k" # Adjust min size required to detach (default 70k) 
g_msg_max "30mb" # Increase max msg size 
g_msg_max_send "100mb" # Increase even more for authenticated users

# Domain level defaults:
att_send "True"     # Enable when sending msgs
att_send_keep "90"  # Days to keep sent msgs 
att_in "True"       # Enable when receiving msgs
att_in_keep "2000"  # Days to keep incoming attachments (5 years)

In addition the ‘user’ can enable/disable this feature in the Attachments item in the web admin self management page.

You can convert existing messages for a user with the command:

tellmail att_detach (IRREVERSIBLE!)

(Please make a backup of the users account before doing this!)

Be warned that this will then result in attachments older than the ‘keep’ settings being deleted the next night.

Quota implications: 30% Of disk space is saved when messages are stored in this format, the size of the users ‘attachments’ are still accounted for in the quota system.

Security implications: The attachments are protected from third party viewing by the long complex url which cannot be guessed (statistically speaking).

If you add -nodetach to the subject of a message, it will leave the message intact.

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