Mozilla’s Thunderbird allows independent developers to add functionality to this very popular e-mail client through extensions called add-ons. Some users never use add-ons, while others use dozens of them. I prefer to only install an add-on when it adds a particular feature that is really useful. There are hundreds of add-ons available that can be very useful enhancements.
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It is clear that several people are having problems with outgoing email with Mozilla’s Thunderbird. Most outgoing e-mail problems are related to improper SMTP (Simple Mail Transport Protocol) configurations. Sometimes an ISP’s server configuration changes. Sometimes the user may not select the proper SMTP server for an account. In this post I will attempt to cover some of the most common configurations that I find in the hope that one of them will work properly with your particular mail server or ISP (Internet Service Provider).
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