SMTP Tool

The SMTP Test can help you identify where your send mail request is encountering issues. Depending on the mail server, you’ll receive a series of responses, possibly with comments to help explain them. There are also a number of SMTP codes: Code: 220 - Message: Service ready Code: 221 - Message: Service closing transmission channel Code: 250 - Message: Requested mail action okay, completed Code: 251 - Message: User not local - forward to [path]

Screenshots from Chrome Web Store