DNN Version 9.9.0
Mail sent from a site, using SMTP test or Feedback module, has not been delivered. This started happening yesterday.
Some investigation shows:
550-5.7.1 [46.22.136.57 11] Our system has detected that this message is 550-5.7.1 not RFC 5322 compliant: 550-5.7.1 'From' header is missing. 550-5.7.1 To reduce the amount of spam sent to Gmail, this message has been 550-5.7.1 blocked. Please visit 550-5.7.1
This was using the CoreMailProvider.
Mail from my module was delivered without and problems. My module uses aspNetEmail from www.advancedintellect.com who seem to have disappeared!
I decided to try the new MailKitMailProvider but it failed with:
Message:A call to SSPI failed, see inner exception.
InnerMessage:The client and server cannot communicate, because they do not possess a common algorithm
Full Error Message:
AbsoluteURL:/API/PersonaBar/ServerSettingsSmtpHost/SendTestEmail DefaultDataProvider:DotNetNuke.Data.SqlDataProvider, DotNetNuke ExceptionGUID:b0308697-46ed-4c05-849f-9e7e14a93c48
AssemblyVersion: PortalId:-1 UserId:-1 TabId:-1 RawUrl: Referrer: UserAgent: ExceptionHash:ADF2KCecl5w9OvzxTafHqm2QVPU= Message:A call to SSPI failed, see inner exception.
StackTrace:
at System.Net.Security.SslState.StartSendAuthResetSignal(ProtocolToken message, AsyncProtocolRequest asyncRequest, Exception exception) at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest) at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult) at MailKit.Net.Smtp.SmtpClient.d__74.MoveNext()
InnerStackTrace: Source:System FileName: FileLineNumber:0 FileColumnNumber:0
Some googling suggests TLS needs to be turned on. I did this in the registry, cleared cache and restarted the site. The problem persists.
The Feedback module returned:
An error occurred while attempting to establish an SSL or TLS connection. This usually means that the SSL certificate presented by the server is not trusted by the system for one or more of the following reasons: 1. The server is using a self-signed certificate which cannot be verified. 2. The local system is missing a Root or Intermediate certificate needed to verify the server's certificate. 3. A Certificate Authority CRL server for one or more of the certificates in the chain is temporarily unavailable. 4. The certificate presented by the server is expired or invalid. 5. The set of SSL/TLS protocols supported by the client and server do not match. See https://github.com/jstedf...slHandshakeException for possible solutions.
Any guidance appreciated.
TLS 1.2
I have found the missing mail. Its all in inetpub\mailroot\Pickup Why? There is nothing in web.config telling it to use the pickup folder and the messages started appering in there a few days back.
If I wanted mail to go to pickup, on my dev machine, I would normally use:
system.net mailSettings smtp deliveryMethod="SpecifiedPickupDirectory" specifiedPickupDirectory pickupDirectoryLocation="C:\MailPickup\iart" / /smtp /mailSettings /system.net
Problem solved. I discovered that the IIS SMTP Virtual Server was stopped
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