Set the From address dynamically according to set rules
If you have several sender addresses configured in your gmail account, it can be embarrassing to use the wrong one for certain emails.
This extension allows you to configure which sender address to use, depending on the recipient address, so if you send an email to firstname.lastname@example.org, it will ensure you send it from email@example.com, and not from firstname.lastname@example.org.
This extension is based on the amazing Inbox SDK (https://www.inboxsdk.com/). The source for this extension is at https://github.com/itsadok/gmail-dynamic-from-sender, and it is available under the CC0 and Unlicense licenses. That is, do whatever you like with it. I don't claim any copyrights.