There are also chances that some web masters may have duplicate profiles in Outlook, which will have an old mail server configured in it, and therefore would be trying to connect to the wrong mail server. This happens especially in the case of newly configured email accounts.Ī mis-spelled mail server name to a wrong port setting in Outlook can cause connectivity issues to the mail server and end up giving error while trying to send or receive mails.īy default, the port settings for mail related services are these, and a connection problem to these ports can lead to Outlook error: SMTP - port 25 / 587 POP3 - port 110 IMAP - port 143 Secure SMTP (SSMTP) - port 465 IMAP4 over SSL (IMAPS) - port 993 Secure POP3 (SSL-POP) - port 995 Most common reason for ‘Outlook cannot connect to SMTP server’ error is the wrong configuration settings of Outlook. To check the connectivity issues from user’s PC or laptop to the mail server, we get the results of ‘telnet 25’ from the users, which shows whether the user is able to connect to the SMTP port in the mail server. This can give errors while connecting to the mail server for sending or receiving mails. Though not so common, third party firewalls and anti-virus software in user PCs can block connection to certain IP ranges, which could include the server IP as well. The SMTP error in Outlook can happen due to many reasons, broadly classified into these categories – 1. What causes ‘Outlook cannot connect to SMTP server’ error In our role as Website Support for web hosting companies, this is a concern we quickly resolve for users who have email accounts hosted in the customers’ servers.Īs a one-size-fit-all solution is not possible for this error, today we’ll see what are the common causes for this error and how we resolve them for the customers. If you continue to receive this message, contact your server administrator or internet service provider (ISP)." The error message they see in their Outlook would be: Task - Sending' reported error (0x80042109) : "Outlook cannot connect to your outgoing (SMTP) e-mail server. Often web hosts get contacted by account owners who are unable to send or receive emails via Outlook.
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