Changes

It almost goes without saying: An email client should allow a person to copy a delimited list of email addresses from a text file and paste them onto a line in the email client so that all the email addresses are sent the email you are writing. Storing a single line of such addresses gives the user a sort of ad hoc mailing list. Just about every email client I have ever used had this "feature" and I sorely miss it in Thunderbird. Would it be so hard to parse the text field for a comma- or semicolon-delimited list of email addresses and move addresses after the first one to subsequent "To:" fields when the cursor leaves the textbox?

Incidentally, also might be quite helpful if one could organize contacts such that one can create a mailing list. (I can't say for sure that this feature doesn't exist. I haven't really looked hard for it.)