LiveChat
Support
Blog
Affiliates
First try restarting your computer. If the error persists try removing the mail account from your mail client, close it, and re-add it.
Email Configuration Tutorials
You will also want to make sure your Internet Service Provider is not blocking port 25 access outside their own service. By opening a shell/command prompt and typing "telnet mail.yourdomain.com 25" you should be able to reach it. If not, your ISP or software you have installed is blocking your access.
Now as an available option you may use port 50 as an alternative port for sending mail via SMTP.
- 535 Users Found This Useful
Related Articles
Outlook: The host yourdomain could not be found - Socket Error: 11001
When receiving the error, The host yourdomain.com could not be found, the POP3/IMAP (incoming...
Outlook: Error Message: An Unknown Error Has Occurred
When you attempt to send a message in Outlook Express, you may receive the following error...
How do I access webmail?
How do I access webmail?Webmail may be accessed using the following...
Why can I not connect to the mail server?
There are several reasons why you may not be able to connect to the POP3 server, and thus, not be...
503 valid RCPT command must precede DATA
When attempting to send email you receive the following message in your mail client software:...
