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FAQ (Frequently asked questions)
This will happen with every new versions of Mail.app, that's something we have to live with when using plugins for Mail. There's however a good news: many times, all you have to do is to run the installer of Universal Mailer again, it will magically re-enable the plugin for you!
There's however a catch here: if a major macOS update comes out, be sure to check the website for updates, there might be a new version that needs to be used with the updated Mail.app!
Since macOS 10.14, Apple requires Mail.app's plugins to be codesigned and notarized. Version 3.0.5 or later should satisfy this requirement.
However, this seems to be iffy sometimes, especially with older versions of macOS. Try manually installing the plugin (UniversalMailer.mailbundle with all its content), by copying it through the Finder, into the /Library/Mail/Bundles/ folder).
This error might also be shown when the installer failed to detect the version of Mail.app you have. Check if a newer version is available.
It largely depends on your personal tastes and also what you mean by 'readable', however I suggest to start with a Helvetica fonts with size 14, and I would specify using points instead of pixels.
This is not a problem of the plugin: the default font is set for all the text that hasn't other font specifications: if you set a specific font for a part of the body (signature included) it will retain your size, not the default one.
Also, be sure to use points and pixels consistently: if you use 15 points in your body, specifying 15 pixels in your signature might be the same on your screen but it certainly change with other screen resolutions! Be sure to double check your signature specification and configure Universal Mailer to do the same.
First, check if you have the plugin installed: you can tell this by opening Mail.app's Preferences. If you see the Universal Mailer logo or a '>>' symbol on the top right, the plugin is there.
Be sure to avoid conflicts between Mail.app's plugins: due to the way Apple handles third parties plugin in Mail, two similar plugins might lead to one of them not working. There are no brilliant solutions here: just try one plugin at a time and keep only those you prefer.
If you still can't see the plugin, you can run a few commands from Terminal.app (you can find it under /Applications/Utilities) to ensure that everything is correctly set up. Some of those commands might ask you for a password: enter your login password followed by the enter key. Please note that there won't be any echo to the screen when you type the password and, if you never used 'sudo' before, the system will warn you about its usage: it's all ok, the commands listed here won't do anything harmful to your computer and you can safely enter the password!
defaults write com.apple.mail EnableBundles -bool YES
defaults write com.apple.mail BundleCompatibilityVersion -int 3
sudo defaults write com.apple.mail EnableBundles -bool YES
sudo defaults write com.apple.mail BundleCompatibilityVersion -int 3
If you're done with the plugin, the easiest way to remove it to trash the UniversalMailer.mailbundle folder, which is located inside the /Library/Mail/Bundles/ folder.
If nothing here seems to help, go to the Discussions space and ask for help.
If you encounter a bug inside the plugin you should first go through all the FAQs (and since you are reading this I suppose you already did so), then try to identify the steps that caused it, then go through all the Discussions, and finally submit a new issue. It is very important to read the existing issues to avoid duplicates: the more duplicates the more the time required to read them, the more the time required to read them the lesser the time available to look at the code and solve it. Sounds simple and complicated at the same time.
Also, if you tag the issue with 'Bug' it speeds things up when reviewing open issues.
Think about it twice: are you sure this feature should be included inside UniversalMailer? If so, describe it by creating a new issue. It helps if you tag it as 'Enhancement' and it also really helps if you explain it in simple terms, don't assume I'm smart :-)
Great! There are many ways to help here: you can either contribute by improving the code (cloning the project and filing a pull request is the way to go) or with anything you think it might help with the plugin such as improvements in the messages, improved graphics, help with the documentation, you name it...
UniversalMailer was always a one person "non business": initially Luca from noware.it wrote the plugin, then I (Barijaona) felt the need to keep it usable for my own usage and I tried later to help other people in need of it… This is to say you shouldn't expect frequent release or prompt responses: it largely depends on how busy I am at the moment. I'll try to read all your writings but you can experience a delay in the response from 1 hour to 1 month or something similar :-)