This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Cannot send emails

  • 1 reply
  • 0 have this problem
  • 7 views
  • Last reply by sfhowes

more options

Outlook no longer supports POP3 so I have installed Thunderbird, with help from my provider, Zen. A can receive messages but cannot send them. Zen cannot help and say it's probably due to a default server name and I need your help. These are3 the messages I receive when trying to send an email:

Sending of the message failed. The message could not be sent because connecting to Outgoing server (SMTP) mailhost.zen.co.uk failed. The server may be unavailable or is refusing SMTP connections. Please verify that your Outgoing server (SMTP) settings are correct and try again.


Set up: Description: zen81982 Server Name: mailhost.zen.co.uk Port: 587 User Name: zen81982@zen.co.uk Authentication method: Normal password Connection Security: SSL/TLS

Outlook no longer supports POP3 so I have installed Thunderbird, with help from my provider, Zen. A can receive messages but cannot send them. Zen cannot help and say it's probably due to a default server name and I need your help. These are3 the messages I receive when trying to send an email: Sending of the message failed. The message could not be sent because connecting to Outgoing server (SMTP) mailhost.zen.co.uk failed. The server may be unavailable or is refusing SMTP connections. Please verify that your Outgoing server (SMTP) settings are correct and try again. Set up: Description: zen81982 Server Name: mailhost.zen.co.uk Port: 587 User Name: zen81982@zen.co.uk Authentication method: Normal password Connection Security: SSL/TLS

All Replies (1)

more options

Try it with the security STARTTLS on port 587.

https://www.zen.co.uk/help-support/emailsetup/