1You have high TX, if you were being attacked, your statistics would be flipped and RX would be high. Another possibility is you miscalculated how much you have transferred from the server – Ramhound – 2018-03-24T14:49:50.733
Answers
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While you can't gain a lot of information from the output of iftop, that server is connecting to a number of mail servers.
If you're not expecting to be sending emails, then the server is compromised and should be shut down.
1You have high TX, if you were being attacked, your statistics would be flipped and RX would be high. Another possibility is you miscalculated how much you have transferred from the server – Ramhound – 2018-03-24T14:49:50.733