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RC4 Cipher

Please note that Postbox does not support RC4 security technology, which is no longer considered secure.

The use of RC4 in TLS is prohibited by RFC 7465 published in February 2015 by the IETF.

As such, RC4 is no longer supported by Postbox. 

Please work with your email provider to adopt a more secure technology, or discontinue use of SSL for your connections.