the IP address you give is a freeserve/wanadoo mail relay.
Have you checked your AVG mail scanner settings to make sure they're all set at 'default'?
Which email client are you using, and how often is is set to check your POP3 mailbox?
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.