Anti-virus programs identifying some connections as risk and, therefore, restricts their usage.Incorrect configuration or settings of a newly set up email account.A virus or bug causing malfunction of the system.These are a few common causes behind this error. Even a slight issue in the settings of the SMTP can have a major impact on the basic functionalities of sending emails. This protocol enables users to transfer emails and messages over the internet. The Simple Mail Transfer Protocol, simply known as the SMTP, is an email protocol that broadly deals with an email’s outgoing function. In this article, we will be exchange views and solutions on reasons and how to fix the Outlook 421 cannot connect to SMTP server error. One such commonly faced issue is Outlook 421 cannot connect to SMTP server error which can be resolved with correct solutions in no time. These are also prone to a few technical glitches which majorly arise due to incorrect configuration or server port issues including recover mail from the Outlook junk mail folder, ‘cannot read from the source file or disk’ error in Outlook. It relies majorly on three email protocols- SMTP, IMAP, and POP. In addition to this, it has a better and improved security and privacy features which is the prime reason why millions of users trust and abundantly use MS Outlook. Its prime function is to organize and manage the personal information of the users which includes their emails, contacts, tasks, appointments, notes etc. Microsoft Outlook is the most sought-after web application in today’s times.
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