Error Message

A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond


This error we might be seeing regularly when we are trying to send an Email using SMTP client settings from our local computer. But, on the internet, we cannot get an exact solution for this issue. After spending an hour I figure out the solution and presenting here.

Generally, we use PORT 25 for SMTP servers other than standard Gmail/Outlook. But, some ISP’s will block this PORT as this port will lead to the security venerability issue and easy to hack our systems and that is the reason, whenever we scan for security it will check is PORT 25 is open or not.

So, using PORT 25 is not recommended now. Instead, use PORT 587 (Message submission (SMTP-MSA), a service that accepts the submission of email from email clients (MUAs).).