On the UTM I configured the SMTP proxy and for one user I have imported the private key so the UTM can sign and encrypt messages.
When I use my laptop and configure it to use the UTM as SMTP server (with TLS and port 587)
I can succesfully send mails which are automatically signed and signatures check okay.
When I configure my Android phone with the same SMTP server settings mails get out, get signed but I get a message at the receiving party that the certificate is invalid.
When I do open the mail I can see it uses the same certificate which is correct. I suppose somehow the message gets changed after it has been signed, but I don't really know how to check this.
It doesn't make a difference whether I connect my phone by 3G or Wifi.
Anyone else seen this behavior of know where to look for any possible problems?
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