530 5.7.0 Must issue a STARTTLS command first
Question asked by Ian Ralph - January 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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Robert Emmett Replied
Employee Post
Under System Admin > Settings > Protocols > SMTP Out, do you have Enable TLS if supported by the remote server enabled?
Robert Emmett
Software Developer
SmarterTools Inc.
(877) 357-6278

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