Topic: Lost connection after DATA (xxx bytes) from unknown[192.168.222.2]
==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.3.2
- Deployed with iRedMail Easy or the downloadable installer? Downloadable
- Linux/BSD distribution name and version: Ubuntu 18.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====
Hi Zhang,
Please help. I'm getting the below error from /var/log/maillog: I've been troubleshooting this for 2 weeks now.
"postfix/submission/smtpd[48795]: Anonymous TLS connection established from unknown[192.168.222.2]: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
postfix/submission/smtpd[48795]: 4DgZ8h5Z47z2hLWR: client=unknown[192.168.222.2], sasl_method=LOGIN, sasl_username=jung@mydomain.com
postfix/cleanup[57131]: 4DgZ8h5Z47z2hLWR: message-id=<04d601d70519$2d974a90$88c5dfb0$@mydomain.com>
postfix/submission/smtpd[48795]: lost connection after DATA (57282 bytes) from unknown[192.168.222.2]
postfix/submission/smtpd[48795]: disconnect from unknown[192.168.222.2] ehlo=2 starttls=1 auth=1 mail=1 rcpt=2 data=0/1 commands=7/8"
The above error showed when I used outlook. It's intermittent. sometimes i can send mail
even with attachment but sometimes the email is just there in "outbox". Sending mail without attachment is perfect.
Here is the troubleshooting steps i've done:
a. Adjusted server timeout in outlook
b. Installed lets encrypt ssl certificate
c. Disabled window scaling (/etc/sysctl.conf)
d. Allowed only IPV4 (/etc/postfix/main.cf = inet_protocols = ipv4)
e. Allowed port 993/587/25 in windows firewall and in ubuntu UFW
f. Attachment size is just kb.
Additional Info:
When sending email using outlook with 5MB attachment, the message landed in "outbox"
I've already increase outlook 2016 attachment size to 25.6MB from regedit "HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\16.0\Outlook\Preferences. note also that in iredmail i've increased the attachment to 35MB.
This is the error i've got sending 6MB attachment:
Task 'jung@mydomain.com - Sending' reported error (0x800CCC0F) : 'The connection to the server was interrupted. If this problem continues, contact your server administrator or Internet service provider (ISP).'
You help is really much appreciated.
Thanks,
JunG
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