Exim with TLS: unknown

[Fidelity]

My e-mail keeps getting in spam for some clients. When I check the headers I see that the SPF is passed. The only weird thing I see is this:

Received: from mail-pa0-f47.google.com ([209.85.220.47])
	by srv1.XXXX.com with esmtpsa (UNKNOWN:AES128-GCM-SHA256:128)
	(Exim 4.76)

Why does it display unknown? It has something to do with the Exim config I'd guess.

I'm sending this e-mail using port 25 with TLS enabled. I'm not using SSL anymore.

 

[zEitEr]

Hello,

The logs refer to receiving emails from google. Do you send your emails from Google?

 

[Fidelity]

Yes, I sent them using gmail but with my own SMTP server setup in gmail. I've received these headers from a friend of mine who also uses gmail and received my e-mail.
Am I interpreting this wrong and doesn't the 'unknown' link to me but to gmail?

 

[zEitEr]

The 'unknown' does not effect your emails. That relates to SSL, TLS.