Fix Outlook SMTP Error 80042109!


These days’ mails and messages play a vital role to run day to day business. As being the most efficient, secure and fastest mode of communication, people really rely on this for their business growth. But at the end of the very hectic and busy schedule it is really important for an individual to manage or organize those mails and messages in a proper way so, that they can be used in the future. In order to facilitate this managing activity many professionals use an email client application of Microsoft i.e. MS Outlook. This is very efficient tool that not only help people to manage their mails and messages but also other important details like contacts, appointments, tasks, journals and so on. In fact by using this application you can easily check your mails and send them too without logging into your mail account.


But this application is very prone to issues which are really hard to resolve. It not only obstructs the work flow but also leads to crucial data loss situations. To understand the situation in a better way let’s consider a scenario where while sending mails to any client through his MS Outlook 2003 application the sender encountered an error message which says –

"Outlook Error 80042109 Outlook is unable to connect to your outgoing (SMTP) server."

SMTP error 80042109 can be caused due to any reason, among which some of the most common reasons include –

  • Misconfigured connection settings.
  • Hardware or software related problems.
  • Application related issues.
  • Corrupt PST file and so on.

So, in order to fix error 80042109 on sending mails from MS Outlook 2003 user need follow certain steps as mentioned below –

  • To begin with first check is ‘SMTP server requires authentication’ option is checked in or not in the settings.
  • As next option check if your firewall is blocking access of Outlook through port 25 and see if the ‘Abuse Detection Item’ option is enabled or not. If it is not then enable it.
  • After that try to change your SMTP port from 25 to your ISP’s alternative SMTP port.

This will fix the problem for sure. But in case the issue persists then the PST file of Outlook must have gone corrupted which need to be repaired. In order to do so, first try to use inbuilt Inbox Repair Tool and then third party Outlook 2003 Repair software which will repair the corrupt PST file and also recover all PST data in seconds.