I hope someone can help, please? I am receiving a message when sending an email to a particular virginmedia email address. the message is "Your message couldn't be delivered. Despite repeated attempts to contact the recipient's email system it didn't respond"
below are the details;
1/13/2021 4:38:20 PM - Server at AM5PR0901MB1443.eurprd09.prod.outlook.com returned '550 5.4.300 Message expired -> 451 4.4.398 Error communicating with frontend host. -> 421 4.4.2 Connection dropped due to SocketError' 1/13/2021 3:45:12 PM - Server at mx.tb.ukmail.iss.as9143.net (22.214.171.124) returned '451 4.4.398 Error communicating with frontend host. -> 421 4.4.2 Connection dropped due to SocketError'
is anyone able to help please, as I cannot find any details for technical support?