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Why does Firefox not allow me to install MailTweak?

TeeSee

I came across a site "mozdev.org" that gives instructions as to how to download a file called "mailtweak-0.16.xpi" Firefox will not allow me to download it and I cannot find it in the list of Firefox add-ons.

Please advise

I came across a site "mozdev.org" that gives instructions as to how to download a file called "mailtweak-0.16.xpi" Firefox will not allow me to download it and I cannot find it in the list of Firefox add-ons. Please advise
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Solução escolhida

You can accomplish this in TB by using BCC. If you send emails frequently to a group, consider a mailing list. For personalized mass mailings, there is MailMerge.

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http://mailtweak.mozdev.org/ appears to be a rather old Extension for Thunderbird as the Thunderbird 3.1 it mentions came out back in June 2010.

I'm relatively new to Thunderbird and the reason I was trying to download that file was to be able to send an email to 50 people individually without all email addresses showing up on each recipients email.

Can anyone please let me know if and how this can be done with Thunderbird.

Thank You

Solução escolhida

You can accomplish this in TB by using BCC. If you send emails frequently to a group, consider a mailing list. For personalized mass mailings, there is MailMerge.

Thank you ... I will try MailMerge