Problema mancato recapito mail errore 550 5.4.300 Message expired -> 421 4.4.2 Connection dropped due to SocketError

Question

Buongiorno ,

Da qualche giorno nella nostra azienda si sta verificando un problema per quanto riguarda l'invio di mail verso clienti esteri (USA e UK) dopo circa 24 ore dall'invio delle mail arriva al mittente la notifica di mancato recapito con i seguenti errori

1/25/2024 8:24:21 AM - Server at DU0PR01MB9432.eurprd01.prod.exchangelabs.com returned '550 5.4.300 Message expired -> 421 4.4.2 Connection dropped due to SocketError'
1/25/2024 8:07:34 AM - Server at mx-eu.mail.am0.yahoodns.net (188.125.72.74) returned '421 4.4.2 Connection dropped due to SocketError'

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Cosa potrebbe essere?

*Nota del moderatore: rimosse informazioni personali

Answer 1

Buongiorno,   Il problema da te descritto è aggiunto tra i problemi attivi su cui Microsoft sta lavorando. Questo problema si verifica solo se il mittente o l’utente che riceve il messaggio utilizza uno specifico servizio di protezione di posta indesiderata di terze parti. Puoi accedere all’Interfaccia di amministrazione di Microsoft 365: https://admin.microsoft.com/ tramite le credenziali del tuo account amministratore > selezionare Integrità > Integrità dei servizi > Informazioni generali > fare clic su “Alcuni utenti potrebbero non essere in grado di inviare o ricevere messaggi di posta elettronica e ricevono un rapporto di mancato recapito durante l’invio” (EX703958) per ricevere ulteriori informazioni sul problema e aggiornamenti sulla risoluzione del problema.

Cordiali saluti Nel caso in cui la risposta sia stata d’aiuto, potresti votare su Utile e contrassegnarla come Risposta preferita. In questo modo potrà essere trovata più facilmente anche da altri utenti.

Answer 2

Salve,

Si stanno verificando ancora molti "mancato recapito" verso i nostri clienti provocando non poche problematiche.

Si può avere un aggiornamento sulla risoluzione del problema?

Salve,

il team del prodotto di Exchange Online ha confirmato che il problema EX703958 è stato risolto. Ti consiglio di aprire una richiesta di assistenza presso il team di supporto di Microsoft 365 for Business.

Gli ingegneri del team potrebbero utilizzare alcuni strumenti di diagnosi per identificare e risolvere il problema. I passaggi sono indicati sul seguente articolo Ottenere supporto - Microsoft 365 admin. Aspetto il tuo gentile riscontro.

Cordiali saluti

Answer 3

Salve,

Si stanno verificando ancora molti "mancato recapito" verso i nostri clienti provocando non poche problematiche.

Si può avere un aggiornamento sulla risoluzione del problema?