387297 - Feature request: limit number of recipients in to: field

Status: RESOLVED DUPLICATE of bug 271405

(Thunderbird :: Message Compose Window, enhancement)

Description

[bugzilla]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.4) Gecko/20070508 Iceweasel/2.0.0.4 (Debian-2.0.0.4-1)
Build Identifier: 

It would be really nice to have a configurable limit on the maximum number of recipients in the to: field.

Example: limit is set to 10

When sending a message with more than 10 recipients in the TO: field, a dialog pops up asking "You are about to send an email with more than 10 recipients. Good email behavior is to hide the other recipient email-addresses from the recipients by using BCC: instead of TO: Would you like me to change this for you?" (somebody please come up with a better text: hope you get the idea :-)

If the user replies yes (the default) then all recipients entered as TO: should be changed to BCC: and the email should not be sent (allowing the user to modify this before sending again).

If the user replies no - the email is sent without further warnings.


Reproducible: Didn't try

Steps to Reproduce:
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One could consider if this should be done at the MTA instead of in the mail client. Putting the feature in the client instead of in the MTA makes it a "soft limit"; the user may bypass the warning and send anyway. This is better in my opinion. The mail administrator could still put in a hard limit if he/she wishes :-)