'send 'mass' (messages addressed to >1 recipient) mailings to individuals seperately' button

[BlipBertMon]

The topic pretty much concisely describes the objective functionality.

This specifically mitigates using Cc: and Bcc: fields for 2nd and subsequent recipients who are otherwise at parity with one another, and prevents leaking e-mail addresses among the >1 recipients, and reduces the iterative finding and 'edit message as new' slog to just a different, single delivery-mode click.

[BlipBertMon]

... and doesn't effectively lower the priority of any message with the 'undisclosed-recipients' address.

[Jon]

Thanks for submitting an idea to the Mozilla Connect community! Your idea is now open to votes (aka kudos) and comments.

[MattAuSupport]

The mail merge addon offers what you seek as well as numerous other personalisation options.

https://addons.thunderbird.net/en-US/thunderbird/addon/mail-merge/?src=ss

[psonnichsen]

Hi,  For a mass E mailing, I have to send 49 at a time or I get errors.  Is there away to send 500 Emails at once?

Thank you

[MattAuSupport]

@psonnichsen  The limit is not in your mail client,  you will find it is imposed by your mail provider.  The company whose name appears after the @ in your email address,  or the email hosting provider you pay as part of your domain hosting.

So the answer is probably get a mail provider that allows more addresses in an email.  Or use a company that provides mail services. For example,  while the Thunderbird "team" develop and offer a mail client.  When they are doing mass mailings to subscribed lists they use mailchimp as this company specialises in marketing emails as opposed to business email.