Install Dovecot email server for unit testing

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https://help.ubuntu.com/community/Dovecot#Choice_of_Mailboxes

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https://github.com/tedivm/DovecotTesting

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Possibly add SMTP support using OpenSMTP - example at https://coderwall.com/p/eejzja. Full documentation at https://www.opensmtpd.org/smtpd.conf.5.html

Easier installation in current Ubuntu: http://packages.ubuntu.com/trusty/opensmtpd

Possible config:

table vmap file:/path/to/file
accept from any for any virtual <vmap> deliver to maildir /path/to/maildir

Alternately, deliver directly to dovecot:
https://www.mail-archive.com/misc@opensmtpd.org/msg00540.html

deliver to mda "/usr/local/libexec/dovecot/dovecot-lda -f %{sender} -d %{dest}"