Device: XG85
Version: SFOS 17.0.5 MR-5
Problem: 451 Temporary local problem, please try again!
some of our outgoing email not successfully sent and bounced back with this error message, i already read/research for available topic for some advice, below are so far are the work around i have done/try but to no avail.
switching to MTA: there is no option in UI that i can enable MTA mode, under email - general settings - SMTP TLS configuration
Smarthost: there is no option in UI also,
Disable Legacy TLS protocol: still no effect, email are still bounced back to sender.
SMTP relay to WAN already enable..
Thank you in advance for your help
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