[Dovecot] Sieve/pigeonhole rejects email addresses for valid UNIX users

[Timo Sirainen]

On 22.8.2012, at 9.56, David Anderson wrote:

> Aug 22 07:50:56 levi dovecot: lda(david at example.com): Error: sieve: envelope sender address 'testuser. at myhost.example.com' is unparsable

Also is this really rejecting the mail?.. When I looked at it I thought it would simply replace the sender with empty string.