Do you support SSL / TLS encrypted connections?

Yes - we do support SSL / TLS encrypted connections both when you are submitting messages to our network and when we deliver messages to the recipient email servers.

What protocols do you support?

We support the following protocols when submitting messages to our network:

  • SSL v3
  • TLS 1.0
  • TLS 1.1
  • TLS 1.2

If you have any issues with your application not being able to negotiate a secure connection please contact us for assistance.

SSL / TLS with Message Submission

To use an SSL / TLS connection when you are submitting messages to our network you will need to do two things:

  1. Enable SSL / TLS in the SMTP settings of your email program, most email program support this.
  2. Enable SSL / TLS on your AuthSMTP account, we enable this by default on all new accounts but may not be for older accounts, to check please login the the control panel and go to the SSL settings page - SSL Settings.

SSL / TLS with Message Delivery

You do not need to do anything to enable SSL / TLS connections with message delivery, we will automatically attempt to use SSL / TLS when delivering messages.

If the recipient email server does not correctly support SSL / TLS, our systems will automatically fallback to plain text delivery, it is not possible to enforce SSL / TLS delivery.

Important Notes

  • SSL / TLS only encrypts the message during transport, it will still be delivered to the recipients inbox in plain text.
  • If you require secure end-to-end encryption then digital signatures and full encryption of your emails is recommended using technologies such as PGP (Pretty Good Privacy).
  • If you are mainly concerned with protecting your AuthSMTP username / password - most email programs will already use methods like CRAM-MD5 to encode / encrypt the username and password without using an encrypted connection. For a list of the authentication methods that we support please see - What type of authentication should I use?
  • Messages sent using SSL may be slower to send and may not be optimal for high volume use (mailing lists etc.).