Konica Minolta SMTP Error 3025
The printer reached the mail server, but the server does not support the STARTTLS upgrade that the configured scan-to-email profile expects.
Error meaning
The SMTP server does not support STARTTLS.
This meaning is tied to the reviewed family/platform and subsystem below; do not reuse the number or wording by itself on a different printer family or protocol.
Applies to
bizhub C287/C227
- bizhub C287
- bizhub C227
Common formatting
These are formatting/lookup aliases for this reviewed condition, not separate error pages.
- 3025
- smtp-3025
What usually causes it
- STARTTLS is enabled on the printer while the selected SMTP service or port does not advertise STARTTLS.
- The SMTP host or port was changed to a service that expects a different encryption mode.
- A mail-server, relay, firewall, or security gateway change removed or intercepted the STARTTLS capability.
What to try
Confirm the configured SMTP server and port
Verify the host name and port belong to the mail service intended for this printer. A correct-looking server name on the wrong port can produce a TLS capability mismatch.
Check the mail server's required encryption mode
Ask the mail administrator whether this relay expects STARTTLS, implicit TLS, or an unencrypted trusted relay on the configured port.
Match the printer profile to the documented server requirement
Adjust the supported encryption/port combination without disabling transport security more broadly than the mail administrator's approved configuration.
Retry a small scan-to-email
Send one small test after the SMTP encryption mode matches. If it fails differently, keep the new code/message separate rather than assuming 3025 still applies.
After each corrective action
Retry the same operation that produced 3025. If it now works, stop there rather than changing unrelated printer, network, supply, or service settings.
If the code returns
If SMTP 3025 returns while the mail administrator confirms STARTTLS is offered on that exact host and port, inspect any relay, proxy, firewall, or TLS inspection device between the printer and mail service.
When service may be needed
This is a mail-server capability/configuration mismatch, not a printer hardware repair. Escalate to the mail/network administrator or Konica Minolta support if both sides are configured for a supported STARTTLS path.
Continue with guided troubleshooting
If the printer still is not working after the reviewed checks, carry this verified error context into the guided troubleshooter.
Related information
Verified source
Official Konica Minolta product-family user guide. Candidate meanings are paraphrased from protocol-specific code tables; manufacturer prose must not be copied into public pages.