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No, it is not possible for Thunderbird to send from something it doesn't know about. You must add the second server if you want to be able to use Thunderbird to send from it.
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Well i have added &gt;&nbsp;1 server. (Additional smtp)
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Thanks - used another account AND identities eventually
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I have a Yahoo account which is having mail forwarded to it from a domain mail server. I'd like to keep it that way if possible.<br />
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The problem: Thunderbird (which has <i>one</i> account only [Yahoo] configured) seems to require more than just additional SMTP accounts configured in order to choose from which address to send a mail. The goal is to be able to send from x@domain, y@domain etc. at will. I'm hoping to be able to achieve this goal without adding additional accounts in Thunderbird. Is it possible?
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I have a Yahoo account which is having mail forwarded to it from a domain mail server. I'd like to keep it that way if possible.

The problem: Thunderbird (which has one account only [Yahoo] configured) seems to require more than just additional SMTP accounts configured in order to choose from which address to send a mail. The goal is to be able to send from x@domain, y@domain etc. at will. I'm hoping to be able to achieve this goal without adding additional accounts in Thunderbird. Is it possible?

Emailing from selectable addresses

Thunderbird is an email, newsgroup, news feed, and chat (XMPP, IRC, Twitter) client that supports POP and IMAP and LDAP address completion. The vanilla version is not a personal information manager, although the Mozilla Lightning extension adds PIM functionality. Thunderbird can manage multiple email, newsgroup, and news feed accounts and supports multiple identities within accounts. Features such as quick search, saved search folders, advanced message filtering, message grouping, and labels help manage and find messages. Thunderbird incorporates a Bayesian spam filter, a whitelist based on the included address book, and can also understand classifications by server-based filters such as SpamAssassin. Extensions allow the addition of features.

Thunderbird

SMTP

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.