Newsletters are sent to a users email addresses, not just the primary email

[leesheppard]

Description
Newsletters are currently sent to a users email addresses, not just the primary email. This duplicates emails unnecessarily.

Expected behavior
A user can have multiple email addresses per profile. However we only wish to send communications to their primary address.

[lee-treehouse]

I'm interested to help with replication steps for bugs. For this one, I was thinking it's a good opportunity to expand the db seeds, Firstly with secondary email addresses https://github.com/rubyaustralia/ruby_au/pull/431/changes/be8383ae21a8c5cea4c642d6cc91af27c9892a45..16bd1ff6c687fbbc6812db9356c9aaa88a47839d

and then with Newsletters/Communications. @leesheppard is Newsletters/Communications the same as Campaigns? I haven't looked at that part of the site, but I could make an issue to generate some campaigns seeds, or something else you might have in mind?

[leesheppard]

@lee-treehouse a "Campaign" was just part of the branding from the email hosting service from Campaign Monitor. In the context of the Campaigns link in the Admin section, that's just where we can review and send official emails out from the Committee. The newsletter has only been of recent, we could include that as part of the listed Campaigns in that Admin section too.