The RETR command did not succeed. Error retrieving a message. Mail server pop.skynet.be responded: no such message.
Sometimes I do not receive messages from Booking.com or from Airbnb. (We are a hotel in Thailand, I am working for the reservations and planning.) Sometimes I can not send a message; (see message received from Mailer-Daemon@yourhostingaccount.com below): 'This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
fa430211@skynet.be all hosts for 'skynet.be' have been failing for a long time and were last tried after this message arrived'
Please help, my business depends on this. Thanks. John (JP Postyns)
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I'm not sure what help can be offered. if the addresses fail, it seems they are incorrect.