Server responded: 503 AUTH command used when not advertisedrn?

I recently migrated from one server where my mail settings worked without a problem to a new server which now results in the following error:

Server responded: 503 AUTH command used when not advertisedrn.

The full SMTP log is:

19:16:12 [MailBee SMTP v. 5.3.0.47. Registered version]
19:16:12 [Connecting to server mail.example.co.uk at port 25 using default domain]
19:16:12 [Domain specified in FromAddr, example.co.uk used]
19:16:12 [Entering ESMTP authentication mode]
19:16:12 [Sending ehlo]
19:16:12 [Using PLAIN ESMTP authentication]
19:16:12 [Error: Negative or void server response]
19:16:12 [Server responded: 503 AUTH command used when not advertisedrn]
19:16:12 [Possible error reason: PLAIN authentication type (auth plain command) is not supported by this server]
19:16:12 [Error: Connection failure]
19:16:12 [Error: Not connected]

Please could someone point me in the right direction as to why this is failing.

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