fix(other): gmail messages not shown

[christer77]

see issue

ref: RFC

[indridieinarsson]

May I add a comment?
The issue ( #1402 ) turns out to be really two different things. One is the inability of gmail to process BODY.PEEK[0.1] (but I think BODY[0.1] is fine, so might consider changing that one back). And I think this PR fixes that (but I'm not quite sure what info we might be missing by changing from [0.1] to [1]? )

The other thing is that in the combined view, the automatic check and renewal of the xoauth2 bearer token (which is valid for 1 hour after renewal) does not take place, and this PR doesn't fix that.

I made some code that seems to fix this part of it : indridieinarsson@3c74c2a
For the dedicated mailbox pages, the old code checks which mail server it is serving, and checks that server for expiry. But the request for the combined view yields and empty list of servers so no check is performed. In this case, I just check expiry for all available servers. A bit course, but maybe harmless.