You've just described one of my biggest problems w/ outsourcing mail, etc.
Really, downtime isn't a big deal (to an extent, of course) because most people realize that "shit happens" and there will be the occasional downtime regardless of who's handling mail.
The problem is that you are, in effect, helpless in these situations. Like you mentioned, you can at least keep your customers updated when it's a problem with your own machines. When you've outsourced it to someone else, you're at their mercy, so to speak.
"What's wrong with the mail system?" "I dunno." "When do you think it will be fixed?" "I dunno." "Today? Tomorrow? Next week?" "I dunno."
It's true that it can be awkward in such situations, but there are two things that still make it "better":
1. Google will bring it back up in a timeframe that is very comparable (if not better) than your average in-house IT team would.
2. Given (1), if you ask people how much per year they are willing to pay for transparency in such circumstances, most businesses will not be willing to dedicate very much of their budget towards it unless it increases reliability. The "helpless" feeling is just because you can't see Google's engineers working to fix it. Surely no one doubts that they are doing their utmost to bring it back.
Really, downtime isn't a big deal (to an extent, of course) because most people realize that "shit happens" and there will be the occasional downtime regardless of who's handling mail.
The problem is that you are, in effect, helpless in these situations. Like you mentioned, you can at least keep your customers updated when it's a problem with your own machines. When you've outsourced it to someone else, you're at their mercy, so to speak.
"What's wrong with the mail system?" "I dunno." "When do you think it will be fixed?" "I dunno." "Today? Tomorrow? Next week?" "I dunno."