from some time i have a problem with send e-mails. I have a Exchange 2013 with SP2, newest CU. When I try to send e-mail with attachment I get a error: I have a kaspersky security 8.0.
SMTPSEND.SuspiciousRemoteServerError; remote server disconnected abruptly; retry will be delayed};{FQDN=};
What i've tried:
- Update Exchange to SP2 and newest CU21
- Update Kaspersky to newest update
- Check SPF with mxtools
- Add new network interface to VM - Exchange machine is a VM @ Windows 2012
- We arent on any spam lists
- Create new send connector: send e-mail by MX record associated with recipient domain, not by any smart host.
- We have a Cisco Router, but not Firewall like ASA - no fixup protocol smtp 25 is not working, There arent any Firewall
- In send connectere I apply logging but there isnt any suspisious in logs.
I dont have any more idea what I can do. Ive tried SMTPDiag but everything looks fine.
Help me please...