Add Exchange Reply by Mail documentation

Sorry for the english but, it's not my main language!

mentioned in issue #2847 (closed)

Added ~15078 label

Apart from a few structural hickups, this looks pretty straightforward and well documented :)

@DouweM I can take this if you don't have time.

@DouweM will probably want to edit this for English fixes and consistency with the other Incoming Mail docs.

@rspeicher fair enough :)

Reassigned to @DouweM

ping @DouweM :)

@axil Would you mind picking it up? :)

Reassigned to @axil

@DouweM sure! It'll have to wait a couple of days, sorry @pupaxxo :/

Milestone changed to 8.5

Added reply by email label

Milestone removed

@axil is this still relevant?

@haynes This information is still relevant! We just had a customer using Exchange 2013 and this documentation assisted. @axil This documentation looks good to me! The parts that needs updating would be the "Test" section sudo -u git -H bundle exec rake gitlab:incoming_email:check RAILS_ENV=production is incorrect. And the RegEx catch all only applies to Exchange 2007 and 2010 - 2013 now supports this natively http://stackoverflow.com/questions/20615849/exchange-2013-mail-flow-rule-using-regex

This agent also works for Exchange versions 2007, 2010 and 2013 https://github.com/Pro/exchange-catchall

Milestone changed to %8.10

mentioned in merge request !4584 (closed)

@MrChrisW thanks for the info! I've created a new MR based on @pupaxxo's so that I can work on directly https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4584 and set it up for 8.10.

Status changed to closed