libemail-valid-loose-perl software package provides Email::Valid which allows dot immediately before at mark, you can install in your Ubuntu 16.10 (Yakkety Yak) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libemail-valid-loose-perl
libemail-valid-loose-perl is installed in your system.
Make ensure the libemail-valid-loose-perl package were installed using the commands given below,
$ sudo dpkg-query -l | grep libemail-valid-loose-perl *
You will get with libemail-valid-loose-perl package name, version, architecture and description in a table
| Distro | Ubuntu 16 10 yakkety yak |
| Section | Perl |
| Package | libemail-valid-loose-perl |
| Version | 0.05-4 |
| Description | Email::Valid which allows dot immediately before at mark |
| Sub Section | perl |