==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 0.9.7
- Deployed with iRedMail Easy or the downloadable installer? downloadable installer
- Linux/BSD distribution name and version: CentOS 6.5
- 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,

I don't know what happened. One account can't send any email with attachment to other email even same mail domain's account.

Recieve email is good.

The email client is Foxmail 7.2. Say "SSL connection error". But same office, same router, same external IP, same email client, other colleague's mail works normally.

dovecot.log :

Feb 26 17:30:22 imap(rd04@xxx.cc): Info: Disconnected in APPEND (1 msgs, 19 secs, 46/55070 bytes) in=146 out=1029
Feb 26 17:30:23 imap-login: Info: Login: user=<rd04@xxx.cc>, method=PLAIN, rip=xxx.xxx.xxx.xxx, lip=xxx.xxx.xxx.xxx, mpid=27346, TLS, session=<DEThtMiCTQB0GL/4>
Feb 26 17:30:42 imap(rd04@xxx.cc): Info: Disconnected in APPEND (1 msgs, 19 secs, 46/57604 bytes) in=146 out=1029
Feb 26 17:30:42 imap-login: Info: Login: user=<rd04@xxx.cc>, method=PLAIN, rip=xxx.xxx.xxx.xxx, lip=xxx.xxx.xxx.xxx, mpid=27350, TLS, session=<hMYJtsiCUgB0GL/4>
Feb 26 17:30:45 imap(rd04@xxx.cc): Info: Disconnected in APPEND (1 msgs, 19 secs, 46/175585 bytes) in=1316 out=44070
Feb 26 17:30:46 imap-login: Info: Login: user=<rd04@xxx.cc>, method=PLAIN, rip=xxx.xxx.xxx.xxx, lip=xxx.xxx.xxx.xxx, mpid=27352, TLS, session=<EMg9tsiCUwB0GL/4>
Feb 26 17:31:01 imap(rd04@xxx.cc): Info: Disconnected in APPEND (1 msgs, 19 secs, 46/3951 bytes) in=145 out=1029
Feb 26 17:31:02 imap-login: Info: Login: user=<rd04@xxx.cc>, method=PLAIN, rip=xxx.xxx.xxx.xxx, lip=xxx.xxx.xxx.xxx, mpid=27359, TLS, session=<1Lcyt8iCWQB0GL/4>
Feb 26 17:31:05 imap(rd04@xxx.cc): Info: Disconnected in APPEND (1 msgs, 19 secs, 46/5442728 bytes) in=148 out=1029
Feb 26 17:31:05 imap-login: Info: Login: user=<rd04@xxx.cc>, method=PLAIN, rip=xxx.xxx.xxx.xxx, lip=xxx.xxx.xxx.xxx, mpid=27361, TLS, session=<Glpmt8iCWgB0GL/4>
Feb 26 17:31:24 imap(rd04@xxx.cc): Info: Disconnected in APPEND (1 msgs, 19 secs, 46/5442525 bytes) in=148 out=1029
Feb 26 17:31:25 imap-login: Info: Login: user=<rd04@xxx.cc>, method=PLAIN, rip=xxx.xxx.xxx.xxx, lip=xxx.xxx.xxx.xxx, mpid=27363, TLS, session=<vGOPuMiCYgB0GL/4>
Feb 26 17:31:44 imap-login: Info: Login: user=<rd04@xxx.cc>, method=PLAIN, rip=xxx.xxx.xxx.xxx, lip=xxx.xxx.xxx.xxx, mpid=27365, TLS, session=<cOe2uciCZAB0GL/4>
Feb 26 17:32:03 imap(rd04@xxx.cc): Info: Disconnected in APPEND (1 msgs, 19 secs, 46/2895 bytes) in=145 out=1029
Feb 26 17:32:03 imap-login: Info: Login: user=<rd04@xxx.cc>, method=PLAIN, rip=xxx.xxx.xxx.xxx, lip=xxx.xxx.xxx.xxx, mpid=27371, TLS, session=<NuPeusiCZgB0GL/4>

Is this OS problem or something? I check that account's mailbox size, postfix's "message_size_limit" and "mailbox_size_limit", all is normally.

Thx.