What:
Create a signature database from which signatures can be selected manually or automatically by predefined rules.
How to know when it's done:
• Done if the user is able to click on "Signatures"-Button at a new mail window to choose from added signatures. The user can also click on "Manage signatures" to see a signatures window or a section in settings to edit the list.
• Done if signature entries in "Signatures" have rules set for them to be auto inserted as signature to a mail (i.ex. If mail is being send to "*@gmail.com" adresse use signature 1, or If mail to "person@domain.com" adresse use signature 2.
• Done if folders which can have rules set to them have specific signatures for mail interactions (just like: #Feature request filters#https://connect.mozilla.org/t5/ideas/thunderbird-different-signatures-for-each-folder/idi-p/23853 by @Flapjack )
• Done if signatures and functionality are the same on desktop and mobile (currently K9) client. This includes HTML signatures mentioned in: #Feature request signatures#https://connect.mozilla.org/t5/ideas/allow-html-signatures-in-k-9-mail/idi-p/28983 by @klikini
Impact on productivity/business:
This comes handy for people which communicate with different people in different languages, or with co-workers or customers while Thunderbird always selects the right signature based on rules or folder rules where respecting filtered mails lay and it is manually selectable by users as well.