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Some Common SMTP Errors In Yahoo Mail

When an error occurs in sending mail, it can be due to several causes. In either case and to make solving the problem easier, the mail applications give an error code and small information. This information will be necessary to locate the problem and solve it. As always, recognizing the problem for which our  mail could not be delivered  can save us a lot of time. Therefore, we have set up a list with the most  popular SMTP errors  when sending emails to make it easier to correct the errors: Common SMTP Errors SMTP 421 - Service not available, closing transmission channel. The message content included offensive content, we're seeing unusual traffic from your servers, or emails from your mail server are creating complaints from Yahoo Mail users. 421 4.7.0 [TS01] Messages from x.x.x.x temporarily deferred due to user complaints - 4.16.55 This error means Yahoo is seeing unusual traffic from your IP address and/or that emails from your mail server are creating complai