User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:18.104.22.168) Gecko/20071025 Firefox/22.214.171.124 Build Identifier: Thunderbird 126.96.36.199 Email alias are a very important feature, surprisingly missing from thunderbird. Even mac mail has it. I use it as an antispam feature. For every site I interact with I will create an alias in my mail server. If I ever get spam from that alias, I just remove the alias an contact the website. Another group of people will use firstname.lastname@example.org, email@example.com all pointing to one email in the server. mac mail accepts email separated by commas and you will get those emails is the from fields when creating a new email Reproducible: Always Steps to Reproduce: 1. 2. 3. Please add this important feature. From what I can see in the forums , a lot of people are asking for it. You should be able to split the string in the email address account configuration and just append each email to the selection option.
This feature is already there, added with bug 44863 marking wfm, pelase reopen if you mean something different