Currently, it is not possible to have multiple signatures for an email account in Mailbird, but it is on our roadmap.
However, you can create multiple identities and add a signature for every identity as a workaround.
While our development team is working offering the ability to have multiple signatures per email account, we would like to count on your support for it so that it is implemented even sooner.
Simply click on the link below to let us know that you would like to be able to have more than one signature for each email account:
Although we are sorry that this feature is not currently available, rest assured that every vote counts as part of our development roadmap, so we appreciate the time you will take to vote for this feature.