Topic: One client can not send emails: lost connection after DATA
==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.4.0
- Deployed with iRedMail Easy or the downloadable installer? downloadable installer
- Linux/BSD distribution name and version: CentOS Linux release 7.9.2009 (Core)
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Web server (Apache or Nginx): Apache
- Manage mail accounts with iRedAdmin-Pro? Yes
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====
We have a very strange problem. We have about 30 domains and more than 100 mailboxes. The users from just one domain have the problem that they can not send email with attachments. (They use SMTP for sending.) In the logs we have always these messages:
Jun 13 13:15:34 s-glb-mail01 postfix/submission/smtpd[21894]: EC7D316E0120: client=unknown[1.2.3.4], sasl_method=LOGIN, sasl_username=user@company.com
Jun 13 13:15:54 s-glb-mail01 postfix/submission/smtpd[21894]: lost connection after DATA (65484 bytes) from unknown[1.2.3.4]
Jun 13 13:15:54 s-glb-mail01 postfix/submission/smtpd[21894]: disconnect from unknown[1.2.3.4]
The strange thing is that the number of bytes is always very low.
Any ideas what could be wrong?
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