There are three tabs for message composer settings where you can set the composer preferences. The General tab covers shortcuts and assorted behavior, the Signature tab sets your signature, and the Spell Checking tab controls spell checking.
In the General tab, you can set the following options:
Default Behavior: Choose how to normally forward and reply to messages, what character set they will use, whether they are in HTML, and whether that HTML can contain graphic emoticons.
You can forward messages either as an attachment or inline, or else as quoted. Choose reply style from the drop-down list: Quote original message, Do not quote original message, Attach original message.
Top Posting Options: When replying, you can choose where to place your signature in the message. You can place the signature either above the original message or at the end of the composer window. Top Posting is not recommended because placing the signature other than at the end of the message is against the mailing standards.
Alerts: There are two optional alerts you can select:
Prompt When Sending Messages With an Empty Subject Line: The composer warns you if you try to send a message without a subject.
Prompt When Sending Messages with Only Bcc Recipients Defined: The composer warns you if you try to send a message that has only Bcc recipients. This is important because some mail servers fail to transmit blind carbon copy if you do not have at least one recipient that is visible to all readers.
The signature editor allows you to create several different signatures in plain text or in HTML, and to specify which of them will be added to e-mail you create in the message composer. If you prefer to use an alternate signature or none at all, you can select it from the mail composer itself.
To choose a spell-checking language, select it here. You must install the gnome-spell package, available through ZENworks® Linux Management, for spell-checking to be available in Evolution. Additional dictionaries are also available through Red Carpet® and are detected automatically if you have installed them. You must also install the aspell package. If this is the case, please contact your packager. To have the composer automatically check your spelling while you type, select Check Spelling While I Type. You can set the color for misspelled words.