Android Question Foutmelding : STARTTLS command used when not advertised

1. 503 Error Code: In SMTP, a 503 error generally indicates a bad sequence of commands. This means that the command was out of order based on the expected workflow or that a necessary preliminary step was not completed.
2. STARTTLS Command: The STARTTLS command is used in SMTP (and other protocols) to initiate a switch from a non-secure connection to a secure connection using TLS encryption. This is important for protecting sensitive information contained in emails from interception or eavesdropping.
3. Not Advertised: This part of the error message means that the server did not include STARTTLS in the list of supported capabilities when it communicated its features. SMTP clients should only issue the STARTTLS command after the server has indicated support for it. If the server does not advertise this capability, it may not support TLS, or the connection may already be encrypted, rendering the command unnecessary or incorrect.

• Check Server Configuration: Ensure that the server is correctly configured to support TLS and that it is advertising this capability properly. This might involve reviewing the server's SMTP settings and ensuring that all necessary TLS certificates are in place.
• Review Client Behavior: The client (or email sending software) should wait to receive the server's capabilities before issuing the STARTTLS command. If the error persists, it may be necessary to review the client's settings or update its software to ensure it handles the STARTTLS negotiation correctly.
• Consult Documentation: Server and client documentation can offer specific insights into configuring TLS settings and troubleshooting errors related to STARTTLS.

ViMeAv ICT said:

I'm using mail.vimeav.nl

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