Mozilla Help: How do I make Mozilla generate the message ID?

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Mozilla Mailnews FAQ

Last updated on April 2, 2006.

How do I make Mozilla generate the message ID?

By default, Mozilla lets the NNTP server generate the message-ID. This can be changed by adding the following line to your user.js:

user_pref("mail.identity.default.generate_news_message_id", true);

Or you can enter about:config in the location bar.
Add the Boolean preference mail.identity.default.generate_news_message_id.
Set the value to true.

This can be set by identity:

user_pref("mail.identity.%identitykey%.generate_news_message_id", true);

Or you can enter about:config in the location bar.
Add the Boolean preference mail.identity.%identitykey%.generate_news_message_id.
Set the value to true.

"%identitykey%" is the id number, as indicated in your prefs.js file. See the Identities tutorial for more info.

Once it is set to true, you can set the String pref mail.identity.default.FQDN to use a custom domain. This can also be set by ID using mail.identity.%identitykey%.FQDN.