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SMTP and Microsoft Office 365

Posted: 03/09/2015 08:10:04
by David Fowle (Standard support level)
Joined: 12/08/2011
Posts: 8

Our product uses your TElSMTPClient (SecureBlackBox v11.0) to connect to Office 365. Everything was O.K. until last week, after which connections are rejected with error-code:10058. I copy the relevant code below:

// Special check for Office 365
if (Server.Pos("smtp.office365") >= 1)
// Explicit SSL
SMTPClient->UseSSL = true ;
SMTPClient->SSLMode = smExplicit ;
// Specify versions of TLS/SSL protocolds allowed
TSBVersions versions ;
versions.Clear() ;
versions = versions << sbSSL3 ;
SMTPClient->Versions = versions ;

Please, can you help?

David Fowle
Posted: 03/09/2015 08:14:34
by Vsevolod Ievgiienko (Team)

Thank you for contacting us.

Currently a lot of servers block SSL3 to eliminate recently discovered types of attacks. First of all you should try to dissable sbSSL3 and enable sbTLS1 and higher versions.
Posted: 03/09/2015 10:20:38
by David Fowle (Standard support level)
Joined: 12/08/2011
Posts: 8

I have fixed the problem by modifying the code to read:

versions.Clear() ;
versions = versions << sbTLS11 << sbTLS12;

AND upgrading to SecureBlackBox v12.

Thanks for the suggestion.

David Fowlle
Posted: 03/09/2015 10:23:28
by Vsevolod Ievgiienko (Team)

Great! Thank you for letting us know.



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