Dovecot LDA errors

[Andy Smith]

Hi list, 

  I'm having an issue on a server thats been running ok for years, its
running Exim 4.91 onto of FreeBSD 10.4 with Dovecot 2.3.1. 

Recently I've started seeing messages getting stuck in the queue for
local delivery and upon checking the Exim log I see this: 

2018-06-01 17:31:09.339 [48228] 1fOmxJ-000CXp-3s
<a.smith at ldexgroup.co.uk>: dovecot_delivery transport output:
lda(a.smith): Fatal: Invalid -f parameter: Path is empty string
2018-06-01 17:31:09.339 [48228] 1fOmxJ-000CXp-3s ==
a.smith at ldexgroup.co.uk <a.smith at ldexconnect.co.uk> R=virtual_localuser
T=dovecot_delivery defer (0): Child process of dovecot_delivery
transport returned 64 (could mean usage or syntax error) from command:
/usr/local/libexec/dovecot/dovecot-lda 

I'm using this line for the LDA in my exim config: 

command = /usr/local/libexec/dovecot/dovecot-lda -d $local_part@$domain
-f "$s
ender_address" -a $original_local_part@$original_domain 

I haven't changed any of the config, but I have updated both Exim and
Dovecot. So obviously the reason seems to be that $sender_address is
null, the obvious place to look I suppose is Exim but I'm seeing this
particularly for things like sieve out of office, which are generated by
the LDA itself and then give this error when trying to deliver the out
of office message to a local user. 

I'll post a question also to the Exim forum, but wondered if this
problem rings any bells for anyone on here? 

thanks in advance! Andy.
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