i have the next problem whe send a mail for smtp Dart VM version: 2.1.0-dev.6.0 (Thu Sep 27 09:51:34 2018 +0200) on "macos_x64" pubspec.yaml environment:
mpv
python-cmd
streaming
plotly.graph-objects
catch-all
mathml
s6
icefaces-3
shortcut
pkg-config
android-timer
siblings
odata4j
tidyverts
context-switch
sdl-2
md5sum
squishit
cdb
twilioflexwebchat
marshmallow
google-streetview-publish
continuation
mathematical-expressions
split-screen
jsonstream
sizetocontent
maxdate
opera-presto
matlab-deployment
