illegal address syntax

[Jonathan Tripathy]

Hi Everyone,

I'm currently in the middle of watching a customer's mail.log file. He 
is trying to send an email to a lot of people at once (Something like 
5000), however the logs don't reflect this. Instead I'm seeing:

May 27 10:32:41 server1 postfix/smtpd[8144]: connect from 
office1.domain.local[10.86.1.101]
May 27 10:32:43 server1 postfix/smtpd[8144]: warning: Illegal address 
syntax from office1.domain.local[10.86.1.101] in RCPT command: 
<contac...@abc+xyz.co.uk>
May 27 10:32:44 server1 postfix/smtpd[8144]: warning: Illegal address 
syntax from office1.domain.local[10.86.1.101] in RCPT command: 
<i...@qrs+tuv.co.uk>
May 27 10:32:55 server1 postfix/smtpd[8144]: too many errors after RCPT 
from office1.domain.local[10.86.1.101]
May 27 10:37:55 server1 postfix/smtpd[8144]: disconnect from 
office1.domain.local[10.86.1.101]

The above is happening over and over again (minute or so) with no sign 
of the other emails being sent. Presumably, the client (Outlook 2003) 
keeps retrying..

As you can see, the client is trying to send an email to 2 email address 
with a + in it, which postfix doesn't seem to like. This may be the 
case, and may be ok, however my concern is that why aren't I seeing any 
emails being sent to the other 4998 valid addresses? Is there anything I 
can do to force postfix use those addresses?

Thanks

Jonathan