Variable number of spaces before date #1406
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Fix IMAP INTERNALDATE regex for variable whitespace
The current regex expects exactly one space after INTERNALDATE, but
RFC 3501 allows variable whitespace. Newer Cyrus IMAP versions (3.8.6+)
use multiple spaces for single-digit dates, breaking the regex match.
Fixes Z-Push sync failures for some IMAP servers, Cyrus being one.