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

[David Anderson]

Self-explanatory, I hope (note the period on the end of the username); 
sieve/pigeonhole does not allow you to have senders which end with a 
period, which means that any UNIX users with such usernames who send 
mail have it rejected by sieve:

# useradd testuser.
# su - testuser.
$ mail david at example.com -s 'testing'
123
.
[testuser. at levi ~]$ logout

# less /var/log/maillog

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

Versions:
dovecot-pigeonhole-0.2.6-21.el5
dovecot-managesieve-0.2.6-21.el5
dovecot-2.0.18-1_134.el5

Why would anyone have a UNIX username ending in a period? For one, web 
hosting companies may use your domain name as your username - but be 
subject to a 32-character limit, so your domain name gets truncated.

David

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