Error 421"Ĭommon reasons for this critical Outlook error 421 are: "An unknown error has occurred: Server error 421"."server responded 421 cannot connect to SMTP server".SMTP error 421 may display in formats like: It may also occur once you have crossed a restricted limit on the email account. This error occurs for temporary problems while sending and receiving emails on the server. The error is to be resolved on time or may cause great inconvenience as it stops and locks all the activities related to your email account. Outlook Error 421 is a common critical SMTP error that hampers transmissions of emails. Part 2: How To Fix "421 Cannot Connect To SMTP Server in Outlook" Issue?.
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