Sorting of emails by sender alphabetically

Hello Happy Grumpy Dozey,

Thank you for reaching out to Apple Support Communities.

Currently these are the options to organize your Mail on iPad:

Organize your mail with mailboxes

You can choose which mailboxes to view, reorder your mailboxes, create new ones, or rename or delete mailboxes. (Some mailboxes can’t be changed.)

To organize your mailboxes, tap the left arrow in the upper-left corner, tap Edit, then do any of the following:

• View mailboxes: Select the checkboxes next to the mailboxes you want to include in the mailboxes list.
• Reorder mailboxes: Touch and hold  next to a mailbox until it lifts up, then drag it to the new position.
• Create a new mailbox: Tap New Mailbox in the lower-right corner, then follow the onscreen instructions.
• Rename a mailbox: Tap the mailbox, then tap the title. Delete the name, then enter a new name.
• Delete a mailbox: Tap the mailbox, then tap Delete Mailbox.

More information can be found here: Organize email in Mail on iPad

You can also leave feedback for Apple directly by going to Mail

Hopefully this helps.

Cheers!