Gmail

Choose the default email app on your iPhone with MailClientDefault10

Most iOS users utilize the Mail app on their device by default for any email-related activities because it’s the stock app for doing so. Unfortunately, after deleting the Mail app (post-iOS 10), iOS won’t redirect mail:to links to your favorite third-party email app when you tap on them.

MailClientDefault10 is a new jailbreak tweak release by HiDan that fixes this problem by letting you configure a third-party email client as the default app for composing emails, which effectively solves the aforementioned problem.