530 5.7.0 Must issue a STARTTLS command first
Question asked by Ian Ralph - 1/4/2018 at 11:11 AM
We're getting emails we send rejected with this error message, from one particular client domain. It's only one domain, and we get "Reason: Remote host said: 530 5.7.0 Must issue a STARTTLS command first"
Any ideas what is wrong? Is it their end or ours? Odd that we've never seen this with any other domain.

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Employee Replied
Employee Post
Under System Admin > Settings > Protocols > SMTP Out, do you have Enable TLS if supported by the remote server enabled?
Ian Ralph Replied
Many thanks for your reply and apologies for the long delay, I have only just seen this. 

Yes, we have TLS  enabled but still the same error message from that particular domain. Haven't seen it on any others!

Any thoughts?

Thanks again


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