Log Message:
balsa: Update to 2.5.7

2019-05-25
    balsa-2.5.7 - encryption, HTML email improvements; bug fixes.

2018-06-01
    balsa-2.5.6 - webkit2 external load fix; reply-to-group improvements.

2018-02-26
    balsa-2.5.5 - crypto and networking improvements; portability fixes.

2016-12-09
    balsa-2.5.3 - gtk3 branch is master now; more bugfixes and ports.

2015-05-30
    balsa-2.5.2 - a release of various bug fixes collected in gtk3 branch.

2013-04-27
    balsa-2.5.1 - next batch of improvents for your mailing pleasure!

2013-02-28
    balsa-2.5.0 - buildable against gtk3 - goes official!