After upgrading from SmarterMail 14 to 15 some of our clients noticed that their outgoing emails are often (not always) marked as spam and not sent (instead they are all in Junk Mail folder). We just upgraded to v.15 and did not change any mail server settings.

 

What changes in SM v.15 affect the outgoing "spam filtering" this strange way?

 

Thank you in advance for your answers.