Hello everybody, Lately I am getting this frustrating message, from time to time, while replying to an ongoing thread. Some times the issue is solved by removing images or links from the original recipient's signature (further down in the thread). Some other times though, I keep trying to find out what is the problem, deleting different parts of the previous emails on the thread, without any luck! Then I have to make my reply as a new separate message, which is just bad! This does not happen very often, and many times I happens only to one out of many of my replies in the same thread! Which really baffles me. Is this a bug? Could somebody help me understand why this is happening? Is there a quick way to spot what and where exactly is the problem with my new email, so that I can remove or change the specific part and do my job? Below you can see the error message I get: "Sending of the message failed. An error occurred while sending mail. The mail server responded: Message detected as spam. [1747131339-578517].. Please check the message and try again." Thank you all in advance