Outlook Send error 0x800CCC78 and 0x800CCC7D

Hi, I hope you can help. On my laptop the Outlook 2002, XP op system, was set up so that my gmail is run through Thunderbird. Recently it has stopped sending messages out and I receive the following two Sending' reported errors: (0x800CCC78) : 'Unable to send the message. Please verify the e-mail address in your account properties. The server responded: 530 5.7.0 Must issue a STARTTLS command first.' 

(0x800CCC7D) : 'Outgoing SMTP does not support SSL...'  - currently my SMTP port is set to 587, IMAP port 993 both have 'This server requires an SSL connection' checked yes.

I am novice at trouble shooting system configurations, it's a wonder I got this far. If someone could please help it would be appreciated.

Reply In reply to deleted message

Try the below mentioned steps for the error 0x800ccc78:

1.    Open Outlook.

2.    Click on Tools->Email account settings.

3.    Click Next for View or change email account.

4.    Double click on the email account.

5.    Click on More settings and click on Outgoing server tab at the top.

6.    Check the box My Outgoing server requires authentication.

7.    Click on Advance tab and change the port number for Outgoing server to 587.

8.    Click ok.

9.    Click next finish.

Now check and see if you are able to send and receive, if not, follow the steps in the article below:


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Question Info

Last updated October 5, 2020 Views 35,649 Applies to: