Garbled Text in Sent box

[kenny.chan]

hmail server showed log in :

"ERROR" 5676 "2018-09-03 10:12:34.392" "Severity: 3 (Medium), Code: HM5075, Source: TransparentTransmissionBuffer::SaveToFile_, Description: Failed to write to the file C:\Program Files (x86)\hMailServer\Data\{}.eml. Data from sender rejected."

"ERROR" 5676 "2018-09-03 10:12:34.392" "Severity: 1 (Critical), Code: HM5019, Source: SMTPConnectionSMTPConnection::HandleUnableToSaveMessage_, Description: Rejected message because no mail data has been saved in file C:\Program Files (x86)\hMailServer\Data\{}.eml"

After that, some email that we sent become garbled.

[mattg]

Does this happen to all mail or just some, or just one?

Unlikely that this error has caused further mail to be garbled - more likely to be unrelated events

[kenny.chan]

some message only.

As we observer for 3 day, once this error log shown, the message would be garbled.

[mattg]

When you say 'the message would be garbled' what exactly are you saying?

How frequently do you get messages like that in the error log?
Can you share the entire message thread form the log leading up to this error, say the previous 2 minutes would be a good start...

[kenny.chan]

no subject in header
and garbled text in the message

30(grabled)/700

[mattg]

When you say 'the message would be garbled' what exactly are you saying?

Is that in following messages?
In other messages?
Where are these messages from?
How do you know that the 'garbled text' wasn't as sent?

hMailserver doesn't do much to message content, except add some headers