Use `sendmail` to send mail.

[orhtej2]

There seems to be a problem in interop between Laravel's mail system and default ynh conf that allows unauthenticated SMTP usage. Using sendmail gets around this problem.

Problem

After installation of Firefly III and creating user app returns 500 on sending invitation.

Solution

Use sendmail method gets around this problem.

PR Status

• [x] Code finished and ready to be reviewed/tested
• [x] The fix/enhancement were manually tested (if applicable)

Automatic tests

Automatic tests can be triggered on https://ci-apps-dev.yunohost.org/ after creating the PR, by commenting "!testme", "!gogogadgetoci" or "By the power of systemd, I invoke The Great App CI to test this Pull Request!". (N.B. : for this to work you need to be a member of the Yunohost-Apps organization)

[ericgaspar]

!testme

[yunohost-bot]

Alrighty!