MailKit vs Two Factor

■MailKit is a kind of mail app(The usage is explained at the online help of the App). 
MailKit can move incoming mail messages to the mailbox specified by rules. MailKit has no mail sending facility and has only support for IMAP.
 POP/SMS/MMS are not supported.
 ■How to connect to an IMAP mail server: To connect an IMAP mail server, just specify your full email address as your login name(username) and the password you log in to your account. If you don't know your login name/password, contact an organization or personnel in charge of the IMAP mail server to get a hostname, user id(name), password. ■Basic operation: * Pull down to Refresh/Long Press to reload&spam filtering * Push up to download older mails at the bottom of message lists *Tap/Swipe to switch accounts Tapping/Swiping the navigation bar of the Mailbox list switches the account if multiple accounts are available. * Tap/Swipe to move around mailboxes (among 'Quick View List') * Move/Delete/Mark mail messages by the toolbar on the navigation bar * Tap/Swipe the navigation bar to turn over mail messages * Add a mail to the blacklist by swiping * Tap a Tab bar to switch the rule view. There are 4 views to show the rules for ‘Sender’, ’Subject’, ‘Message’, ‘Compound’. ■Mail Rules: There are 4 conditional fields for mail rules --- sender, subject, message, compound. Mail rules are only applied for 'INBOX'. To edit or create a mail rule, tap 'Edit' button on the Mailbox list. The selection menu appears, choose 'Rule'. Mail rules for ‘Sender’ will appear. Tap a Tab bar to switch a view. ■Support: To get a further support , contact through the following mail address. support_seimitsu@jcom.home.ne.jp

Two Factor is a modern authenticator app to generate 2-step verification codes for your accounts. Crafted exclusively for iOS and macOS, your secrets codes stay synchronized and protected. The app respects your privacy - it functions entirely offline with no tracking or analytics, no advertisement, and no data collection. Nice benefit - it weights less than a single photo on your iPhone. Import and export codes any way you prefer - scan QR codes with your camera, import from screenshots, drag and drop images (on Mac and iPad), or manually enter secrets. Key Features: • Secure storage • iCloud synchronization across all your Apple devices • Face ID/Touch ID support for quick access • Multiple password-protected vaults • Drag & drop QR codes from screenshots or images • Support for TOTP, HOTP and other common codes • Secure storage for plaintext secrets • No internet connection required - works completely offline • No ads, no tracking, no data collection Perfect for: • Securing social media and email accounts • Anyone remotely concerned about privacy and security • Anyone who is tired of spending hours migrating keys to new devices.