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From: "Sharma, Ashish" on 28 May 2010 08:59
Hi,

I have deployed postfix as an incoming mail receiving server.

On this I have a custom mail filter (based on jilter api):

My 'main.cf' file for milter settings is as follows:

#Milter support for smtpd mail
smtpd_milters =
inet:localhost:10026, # dkim milter
inet:localhost:10027, # sid milter
inet:localhost:10028 # custom java milter

# Milters for non-SMTP mail.
non_smtpd_milters =
inet:localhost:10026, # dkim milter
inet:localhost:10027, # sid milter
inet:localhost:10028 # custom java milter

milter_default_action = reject

# Postfix . 2.6
#milter_protocol = 6
# 2.3 . Postfix . 2.5
milter_protocol = 2

Now following are my queries:

1. Is it expected and in accord with milter protocol to reuse the same connection i.e. should postfix communicate with milter over same single connection?

2. If the above is correct how can I disable that?

3. Does postfix caches the connections with milters?

The above questions arises on the following observation:

"Intermittently if multiple email are sent where 'from' and 'to' headers are unchanged.

What is observed is , new connection with Milter is not created for 2 emails.

Infact both the emails having different messageID are sent on same connection. Although even one may be the reply of the other."

Thanks in advance
Ashish Sharma

From: Wietse Venema on 28 May 2010 09:09
Sharma, Ashish:
> 1. Is?it expected and in accord with milter protocol to reuse the same connection i.e. should postfix communicate with milter over same single connection?
>

The SMTP protocol specifies that ONE SESSION can have MULTIPLE
MAIL FROM/RCPT/DATA transactions.

One MILTER connection covers ALL the MAIL FROM/RCPT/DATA transactions
in that session.

Wietse

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