unknown content transfer encoder: 8bit

[RevoutIT]

Hello, if an email has content transfer encoding: 8bit, an exception is thrown at EmailConverter.mimeMessageToEmail(mimeMessage): unknown content transfer encoder: 8bit. Can this please be changed so that encoder is ignored in this case?

https://learn.microsoft.com/en-us/previous-versions/office/developer/exchange-server-2010/aa563055(v=exchg.140)

Thank you!

[bbottema]

Do you have an example message I can work with?

[RevoutIT]

Hello, here is the email that caused the problem.
test8Bit..zip

[bbottema]

Which version are you on? I'm having no issues with 8.x.x.

[RevoutIT]

8.3.2

[bbottema]

I'm not able to reproduce the problem with 8.3.2 and your example message, unfortunately. Do you have a stack trace?

[RevoutIT]

java.lang.IllegalArgumentException: unknown content transfer encoder: 8bit
at org.simplejavamail.api.email.ContentTransferEncoding.lambda$byEncoder$1(ContentTransferEncoding.java:55)
at java.base/java.util.Optional.orElseThrow(Optional.java:403)
at org.simplejavamail.api.email.ContentTransferEncoding.byEncoder(ContentTransferEncoding.java:55)
at org.simplejavamail.converter.EmailConverter.buildEmailFromMimeMessage(EmailConverter.java:673)
at org.simplejavamail.converter.EmailConverter.mimeMessageToEmailBuilder(EmailConverter.java:139)
at org.simplejavamail.converter.EmailConverter.mimeMessageToEmailBuilder(EmailConverter.java:125)
at org.simplejavamail.converter.EmailConverter.mimeMessageToEmail(EmailConverter.java:101)
at org.simplejavamail.converter.EmailConverter.mimeMessageToEmail(EmailConverter.java:93)

[bbottema]

I have no idea how that would even be possible. At any rate, I can't reproduce it with 8.3.2, and I've expanded the junit tests to test this particular case, which also builds fine in the pipeline. I'm not sure what else I can do here.

No clue what's going on in your case. Maybe something related to reflection code on your end? Or a server fooling around with class loaders? Surprising indeed. I don't see any other way than to close this as user error, even if the cause is unknown. I'll happily reopen if you come up with more data (perhaps you're able to debug into the class and see what is happening).