IPhone – Why is the message body not displayed in iPhone’s mail app

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The normal mail app correctly shows a list of mails in my mailbox including a preview of the message body. When I tap any of them, the mail opens and correctly shows the mail header (sender, subject, date etc.) but the message body is blank.

When I look at the same mailbox using Gmail webpage, I see the identical mails with message body intact so I know that it's not a problem with the mails or the mailbox itself.

I'm using not-broken iOS 4.1 on an originally Apple-unlocked iPhone 4.
I'm using Google's official setup for Google Apps on iPhone.
I've tried purging the mail/contacts/calendar settings and following Google's setup from scratch. The problem is still there.

How can I fix it so the message body is displayed?

Response to answer:
– This used to work flawlessly, but appeared recently, without any obvious change by me.
– It might have been broken by the 4.0.2–>4.1 upgrade?
– The problem appears on wifi and on GPRS/3G, in any location, and isn't related to download delays (keeping a "blank" message open for a minute doesn't make it appear).
– It also isn't fixed by rebooting the phone.

Follow-up:
This is very weird. It seems to break every few months but only lasts a few days, then magically starts working again. Before, during, and after these incidents, I just use my phone normally and don't mess with any network settings or phone settings. I honestly have no clue what's going on.

Best Answer

Has this setup ever worked?

Have you tried just using plain vanilla IMAP?

Is this possibly due to poor connectivity—maybe you have a weak network connection and it's just blank until the entire message downloads?