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Ev4ld's avatar
Ev4ld
Copper Contributor
Dec 15, 2023
Solved

TLS Client issues on Exchange server on premise

hi all, I have on-premise Exchange 2013. When I send email to 1 particular domain it returns "530 Must issue STARTTLS". This got me thinking that my TLS settings might be misconfigured. So i did try...
STARTTLS
TLS
  • Ev4ld's avatar
    Ev4ld
    Dec 18, 2023
    Problem was solved by installing certificate on GFImailessentials (perimeter smtp server) through IIS. Even though same certificate was installed on the server before, somehow it was not used for secure communication..
TaeYounAnn's avatar
TaeYounAnn
MVP
Dec 18, 2023

Ev4ld 

Try changing the IgnoreSTARTTLS value to True!

  • Ev4ld's avatar
    Ev4ld
    Copper Contributor
    Dec 18, 2023

    TaeYounAnn i tried, didn't help..

    • Ev4ld's avatar
      Ev4ld
      Copper Contributor
      Dec 18, 2023
      Problem was solved by installing certificate on GFImailessentials (perimeter smtp server) through IIS. Even though same certificate was installed on the server before, somehow it was not used for secure communication..

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