When Remind-Me sends e-mail using your default email client, it uses the "Simple MAPI" interface. Most common e-mail programs support Simple MAPI. An e-mail client is an email program that runs on your local PC, and you can configure it to send through any email account you want to use. Common e-mail clients are Outlook, Thunderbird, The Bat!, etc. To use this sending method your e-mail client must be a 32 bit program and support Simple MAPI. Most popular e-mail programs do support Simple MAPI. Any e-mail client that supports Simple MAPI should work.
Use "Default Apps" (Windows Settings / Apps / Default Apps) to select a default Email app. You may also have to enable Simple MAPI support in your e-mail client.
Troubleshooting: If you're having trouble getting your email client to work, make sure you have a 32 bit version of your email client installed. Also, you can use "regedit" to verify MAPI is enabled by browsing here:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Messaging Subsystem
and verify you have a string value named MAPI set to a value of 1. If necessary, add it using regedit.
Omit SMTP Prefix option:
Some older e-mail clients do not interpret the MAPI address field correctly. When this happens you will see a "SMTP:" at the beginning of the e-mail address. To fix this you can turn on the option "Omit
SMTP Prefix" in
the E-Mail Configuration dialog. This will
change the way Remind-Me sends the address field, so the "SMTP:" will not be in
the e-mail address.