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Outbound Email Delivery - Troubleshooting Article – KerioConnect Support
Method 'send' in COM object of class 'CDO.Message' returned error code 0x80040213 (<unknown>) which means: The transport failed to connect to the server. - Microsoft Dynamics AX Forum Community Forum
SCOM: Report Subscription “Failure sending mail: The transport failed to connect to the server” | Discuss IT Now - Microsoft Operations Manager: Manage Everything
SCOM: Report Subscription “Failure sending mail: The transport failed to connect to the server” | Discuss IT Now - Microsoft Operations Manager: Manage Everything
Solved: Crowd cannot communicate with mail server
Nilesh Gajjar - Business Central & NAV: Dynamics NAV Error : The SMTP mail system returned the following error: "Failure sending mail. Unable to read data from the transport connection: net_io_connectionclosed."
Track-It 11.4 Office 365 SMTP settings not working - Discussion - BMC Community
The transport failed to connect to the server - 0x80040213 — mibuso.com
Message Has Lines Too Long For Transport - cPanel Fix - Nocinit
Simple Mail Transfer Protocol: Meaning, Uses, Best Practices | Spiceworks - Spiceworks
Error 'Uncaught Exception: Failed to Authenticate on SMTP Server With Username' When Sending Auto-Responses – Kayako Classic Support
Solved: SMTP Connector for Qlik Sense Error in Connecting - Qlik Community - 1512970
How to Configure Exchange Server 2016 SMTP Relay
Message transport components in Exchange Server 2019
CDO message problem-VBForums
How to Test an SMTP Server with Telnet. Step-by-Step Tutorial
External Mail Flow Not Working After Exchange Server Upgrade
Run-time error -2147220973 (80040213) the transport failed to connect to the server
Unable to connect to Email settings Gmail/outlook - Katalon Studio - Katalon Community
SMTP Error (Yahoomail / Bizmail) - Technical Forum - Dynamics User Group
ConfigMgr, Tips and Tricks: Failure sending mail: The transport failed to connect to the server
Mail loop between Hybrid and legacy server. 421 4.2.1 Unable to connect or 451 4.4.397 Error communicating with target host or 451 4.7.0 Temporary server error – Modern 365
Configuring the TLS Certificate Name for Exchange Server Receive Connectors | Practical365
Failure sending mail: The transport failed to connect to the server.
Fix: StartTLS is Required to Send Email – TheITBros