Hi all,
Trying my hand at post multi setup with the aim of isolating mail
traffic in the following way;
Node traffic eg firewall notifications, ids notifications etc binding to
localhost and the private lan ip address.
Internal company emails for employee to employee to reduce phising risk etc
customer emails to allow our customers to send from there own domains
app emails for other non human led email eg website no replies,
newsletters etc.
So far I have node traffic working perfectly, Im getting alerts about
hack attempts, core file changes, ssh logins etc
internal company emails with instance name postfix-internal keep failing
to pass inbound emails on to dovecot's LMTP (Dovecot is on a different
server (via tcp)) the virtual routing of the messages is working, it's
matching the email addresses to the correct imap accounts and I can
authentication using dovecot at the sasl method.
But the LMTP connection is timeing out from the second instance (but
working for the default instance)
I have used tcpdump and can see the connection trying to be established
but no ack is being received wireshark reading the pcap file keeps
saying "Conversation Completeness: Incomplete, SYN_SENT (1)" with TCP
retransmission for every attempt.
I have tried with and without firewalls with the same issue.
Any pointers would be appreciated.
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