Interestingly, Microsoft has the following warning when changing your password: The problem persists after you turn off my AV, turn off my VPN, from Thunderbird in safe mode and even after the addition of a '1' at the end of my password 16ch. When you use a plus 16-character password, Thunderbird fails to connect to the SMTP outgoing/outlook live. Password restricted to 16 characters when sending messages via the mail server outgoing Live/Outlook My outgoing mail SMTP server show iCloud when starting to send mail, but turns into iCloud (offline) once I hit the button to send the e-mail, I need help in this case I need to send mails from urgent may, thanks Maria T My mail server outgoing SMTP seems to be deleted, I can't send mail more! If you cannot send or receive e-mail on your Mac - Apple Support If ports of edition does not solve the problem or you still have other problems of e-mail, you can also find this article helpful: Again, you should see an option that defines the Port: and authentication. In the window that opens, you would select the correct outgoing server in the list above, then select the tab Advanced settings below. Then, in the tab main account information, where it says mail server outgoing (SMTP), you click on the menu down and select Edit SMTP Server list.

For the outgoing server, you would go to Mail > Preferences > accounts and select your account on the left.

Must say Port: and allow you to select the authentication. For the incoming server, you would go to Mail > Preferences > accounts, select the account in question on the left side, and then select the Advanced tab to the right. If you think it may be a problem with incorrect port, it is possible to change the configuration of the port for both mail servers incoming and outgoing, but not in the same place: Sorry to hear that you encounter these problems with your e-mail account in El Capitan. Thank you for using communities Support from Apple.

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