Hi all,

I'm using Haraka with STARTTLS enabled - I'm getting some strange behaviour 
which only seems to happen when dealing with Microsoft clients and I wonder 
if anyone might have any pointers as to how I can fix or workaround the 
issue.

I've done some Wireshark traces and it shows the socket being successfully 
upgraded after the client sends STARTTLS and I correct see all the relevant 
SMTP commands up to DATA and then the message data comes in followed by the 
ending dot, then boom!

client ch1ehsobe001.messaging.microsoft.com [216.32.181.181] connection 
error: Error: 3074803408:error:06065064:digital envelope 
routines:EVP_DecryptFinal_ex:bad 
decrypt:../deps/openssl/openssl/crypto/evp/evp_enc.c:467:#0123074803408:error:06065064:digital
 
envelope routines:EVP_DecryptFinal_ex:bad 
decrypt:../deps/openssl/openssl/crypto/evp/evp_enc.c:467:

The Wireshark trace shows that we get the data and acknowledge it - I then 
see a TLSv1 packet being sent by us containing two application data records 
followed by an Encrypted Alert record followed by a FIN, ACK.

It works without issue with other clients - I've only seen this problem 
when the connecting client is running Microsoft Exchange.

Anyone have any ideas?

Kind regards,
Steve.

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