Each email service has its own quirks in how the account has to be set up in Outlook 2019 (or any mail program) to properly send and receive. Outlook 2019 can automatically detect the settings in many cases, but it can’t always detect every service correctly. If Outlook 2019 wasn’t able to successfully send a …

Cannot send messages | Thunderbird Help Verify your SMTP outgoing email settings. In the Thunderbird menu bar, click the Tools Edit menu and select Account Settings, or click the Application menu button and select Options Preferences and Account Settings from the sub-menu, and select Outgoing Server (SMTP) from the bottom of the list in the left panel. Check that the settings are the same as documented on the mail settings article Send/Receive errors - HowTo-Outlook Nov 09, 2011

May 19, 2019

Unable to receive emails in Outlook - Microsoft Community

Email sent using Outlook are not saved to the Sent Items

Unable to send emails to hotmail/outlook or live email Jul 14, 2020