![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_2446.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'
![spring boot - I am getting this error: Could not connect to SMTP host: smtp.gmail.com, port: 25; - Stack Overflow spring boot - I am getting this error: Could not connect to SMTP host: smtp.gmail.com, port: 25; - Stack Overflow](https://i.stack.imgur.com/5l7U0.png)
spring boot - I am getting this error: Could not connect to SMTP host: smtp.gmail.com, port: 25; - Stack Overflow
![after sending few emails Could not connect to SMTP host , nested exception is: java.net.ConnectException: Connection refused: connect - Stack Overflow after sending few emails Could not connect to SMTP host , nested exception is: java.net.ConnectException: Connection refused: connect - Stack Overflow](https://i.stack.imgur.com/N4nMQ.png)
after sending few emails Could not connect to SMTP host , nested exception is: java.net.ConnectException: Connection refused: connect - Stack Overflow
![mail(): Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" - YouTube mail(): Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" - YouTube](https://i.ytimg.com/vi/Pfvlpw7Q-uQ/maxresdefault.jpg)
mail(): Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" - YouTube
![jakarta ee - Email notification using java i can face error as Could not connect to SMTP host: RELAY.MY.COM, port: 25, response: 421 - Stack Overflow jakarta ee - Email notification using java i can face error as Could not connect to SMTP host: RELAY.MY.COM, port: 25, response: 421 - Stack Overflow](https://i.stack.imgur.com/n5voZ.jpg)
jakarta ee - Email notification using java i can face error as Could not connect to SMTP host: RELAY.MY.COM, port: 25, response: 421 - Stack Overflow
![Unable to Send Email in MFT (Post-Processing Rule) - webMethods - Software AG Tech Community & Forums Unable to Send Email in MFT (Post-Processing Rule) - webMethods - Software AG Tech Community & Forums](https://global.discourse-cdn.com/techcommunity/optimized/2X/c/cc5e8bc3beb7508fdd5a4d7529e630f1fe852368_2_535x500.png)
Unable to Send Email in MFT (Post-Processing Rule) - webMethods - Software AG Tech Community & Forums
![javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25; - 漫步花海下的oldman - 博客园 javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25; - 漫步花海下的oldman - 博客园](https://img2020.cnblogs.com/blog/1469305/202005/1469305-20200530095010803-2122632035.png)