Criteria updates to email: Require export and headers

[dngray]

We don't stipulate that providers must support IMAP connectivity, because in some cases that is not a requirement for users, we do believe all providers must have export functionality in some way or another so that users can choose to leave at a later date.

We also believe all providers must have a feature to see "advanced information" about the emails such as their headers.

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[freddy-m]

LGTM

[dngray]

Hmm, thinking I should probably mention that Tutanota at this time doesn't really allow for a bulk export. tutao/tutanota#1292 states

As a user i want to be able to export all the emails in my mailbox at once so that i don't have to go through each folder and select the emails.

While they have made an attempt there with this prototype feature tutao/tutanota@3dfd7ab

Prototype export mails feature

This is per folder, and currently only available on custom folder, but
this is only a UI limitation. Works even for folders with 1000+ emails.
It does get some 429 (rate limits?), but in the end it works. It does
take quite a bit of time, though. A clear message of "downloading" and
maybe a progress bar would be nice.

It seems that this isn't yet a part of the main product.