I have a question about apache email license.

[이준균]

Hello I\'m a Korean developer I do not good at English I beg your
understanding Question 1If I modify apache email source, should I make
modified source public? For example, in githubThe apache email library
refers to javaxmail library (CDDL + GPL 20), so I think it should publish
the source of the modified apache email Is this correct? please reply Thank
you