![Getting this error message: The message could not be sent because the connection to Outgoing server (SMTP) smtp.gmail.com was lost in the middle of | Thunderbird Support Forum | Mozilla Support Getting this error message: The message could not be sent because the connection to Outgoing server (SMTP) smtp.gmail.com was lost in the middle of | Thunderbird Support Forum | Mozilla Support](https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/images/2020-03-02-03-19-49-338f62.png)
Getting this error message: The message could not be sent because the connection to Outgoing server (SMTP) smtp.gmail.com was lost in the middle of | Thunderbird Support Forum | Mozilla Support
![failure sending mail: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL failure sending mail: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL](https://s3.amazonaws.com/higherlogicdownload/NAVUG/UploadedImages/YPxeJoMYSxsR2VYnAbXP_temp.png)
failure sending mail: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL
Error (0x80042109): Outlook cannot connect to your outgoing (SMTP) e-mail server. | Web Hosting Forum - Review - Community & Resources
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at « Asp.Net,MVC,C#.Net,VB.Net,Windows Application,WPF,Javascript,jQuery,HTML,Tips and Tricks,GridView
![Could not connect to this SMTP server. Check your network connection and that you entered the correct information in the Account preferences. | NetworkOverload Could not connect to this SMTP server. Check your network connection and that you entered the correct information in the Account preferences. | NetworkOverload](http://www.networkoverload.com/i/mailerror-SMTPset2.png)
Could not connect to this SMTP server. Check your network connection and that you entered the correct information in the Account preferences. | NetworkOverload
![Enable to send email, server reported error" or "Email server reported an error ... Could not connect to SMTP host" error when trying to send email inside 'Command Center' Enable to send email, server reported error" or "Email server reported an error ... Could not connect to SMTP host" error when trying to send email inside 'Command Center'](https://www.ibm.com/support/pages/system/files/inline-images/image_2458.png)
Enable to send email, server reported error" or "Email server reported an error ... Could not connect to SMTP host" error when trying to send email inside 'Command Center'
![Specifying Authentication Method for SMTP Server - Canon - imageRUNNER ADVANCE C3330 C3325 C3320 - User's Guide Specifying Authentication Method for SMTP Server - Canon - imageRUNNER ADVANCE C3330 C3325 C3320 - User's Guide](https://oip.manual.canon/USRMA-0320-zz-CS-enUV/contents/images/book_images/b_secu_079_01_b_C.jpg)
Specifying Authentication Method for SMTP Server - Canon - imageRUNNER ADVANCE C3330 C3325 C3320 - User's Guide
![Roundcube SMTP Error (-1): Connection to server failed - Articles | DirectAdmin How-to Guides and Knowledge Base Roundcube SMTP Error (-1): Connection to server failed - Articles | DirectAdmin How-to Guides and Knowledge Base](https://help.poralix.com/_mod_files/ce_images/poralix/roundcube-connection-to-server-failed.png)