Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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.

Avatar for Username

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

This thread was archived. Please ask a new question if you need help.

Problem sending emails with attachment

  • 4 replies
  • 1 has this problem
  • 1 view
  • Last reply by WheeWhilly

WheeWhilly
WheeWhilly
more options

Just recently, I get this message that blocks my sending emails with attachment. Why? or how can I fix this. I have spoken to Shaw Cable and they suggested contacting Thunderbird.....

Sending of the message failed.

The message could not be sent using Outgoing server (SMTP) mail.shaw.ca for an unknown reason. Please verify that your Outgoing server (SMTP) settings are correct and try again.

Just recently, I get this message that blocks my sending emails with attachment. Why? or how can I fix this. I have spoken to Shaw Cable and they suggested contacting Thunderbird..... Sending of the message failed. The message could not be sent using Outgoing server (SMTP) mail.shaw.ca for an unknown reason. Please verify that your Outgoing server (SMTP) settings are correct and try again.

Chosen solution

Tools/Account Settings, Outgoing Server (SMTP) at the bottom of the left pane.

Read this answer in context 👍 1

All Replies (4)

sfhowes
sfhowes
  • Top 10 Contributor
more options

What are your settings? They should be: mail.shaw.ca on 587, STARTTLS, authentication = normal password, User Name = part of address before @.

Use a 'strong' password.

WheeWhilly
WheeWhilly Question owner
more options

Not too computer savvy. So, how do I bring up 

mail.shaw.ca on 587, STARTTLS,

? Thanks in advance

sfhowes
sfhowes
  • Top 10 Contributor
more options

Chosen Solution

Tools/Account Settings, Outgoing Server (SMTP) at the bottom of the left pane.

WheeWhilly
WheeWhilly Question owner
more options

Thank-you my friend. Seems to have solved the problem