==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release):
- Linux/BSD distribution name and version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Web server (Apache or Nginx):
- Manage mail accounts with iRedAdmin-Pro?
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====
After update my server (debian jessie) and iredmail according to upgrade notes i have strange behavior from postfix.
If i connect and start mass emailing to our customers or employes and there will be a wrong email address from our domain (removed mailbox) postfix now disconnect, not only reject

Oct 01 12:21:47 mail postfix/smtpd[1342]: connect from host[ip]
Oct 01 12:21:47 mail postfix/smtpd[1342]: NOQUEUE: reject: RCPT from host[ip]: 550 5.1.1 <ludmila@ricom.ru>: Recipient address rejected: User unknown in virtual mailbox table; from=<morsov@ricom.ru> to=<wronguser@domain.tld> proto=ESMTP helo=<localhost>
Oct 01 12:21:47 mail postfix/smtpd[1342]: too many errors after RCPT from host[ip]
Oct 01 12:21:47 mail postfix/smtpd[1342]: disconnect from host[ip]

Here is log when i just try to send one email to one wrong person and it's "too many errors". I cant figure out where it get too many error for one email?

iredmail 0.9.8
debian 8.11 (jessie)
backend mysql
apache
no  iRedAdmin-Pro