Apple Mail - How to Group Emails by Sender

I think you missed the first sentence in my reply:

"You can group Apple Mail emails by sender by clicking on "From" at the top of that column in the email display. "

The Contacts list is fully integrated across all the Apple platforms, programs (email, messages, telephone) and devices (iPhones, Macs, iPads, etc.), through iCloud, and it also is integrates to include contacts from other tools like those of Google, Microsoft, and so forth. Adding someone from an email to Contacts is as easy as right clicking on their name. It is certainly nothing like storing names on SIM cards. If you add an email sender to Contacts, they are also available immediately on your iPhone and other iCloud devices. It is not a dinosaur but you are certainly entitled to your opinions.

Unibox is the dinosaur as it was abandoned 7 years ago and presents an interface that seems like those on PCs from many years ago. It tries to juice up the user's emails to appear more like text messaging, which is fine if that's what you want.

Why don't you send Apple feedback directly and explain what you want them to do to Apple Mail:

Product Feedback - Apple

The Apple Discussions is not the right place for that because it is primarily users who answer other user's questions, but it is nota direct line to Apple.

I contact with hundreds of people, and my mail is filed away in dozens of folders and mailboxes.

An overall view "by sender" would be meaningless;

however, if I needed to see all the mail from one particular sender (or from a group of people), there is an easy way to do it in Mail: create a Smart Mailbox.

You can group Apple Mail emails by sender by clicking on "From" at the top of that column in the email display.

Under View menu of the Mail program you can click on Organize By Conversations.

The picture of the person sending you emails can be made to appear by making them one of your contacts and including their email address in the Contact info.

You can do these things in Apple Mail but the interface is less slick than the Unibox one.

Everyone should find the style that works best for them.

For me, work emails often have dozens (sometimes many dozens, sometimes hundreds) of recipients and participants, and filing them by sender makes no sense, especially when there are multiple replies and conversations. Instead, I group them by conversation and file them under the Project they pertain to.

And having pictures of senders ... that certainly does not add value for me (although Apple Mail and MS-Outlook both do this from their respective Contacts lists). Your emails seem to be mostly between individuals; mine are typically involving large teams, and there is often lengthy text plus large file attachments. The features of Unibox would not be of interest to anyone in my workplace, given our work flow and environment. We file our emails by Project, almost never by the individual sender.

For personal emails, Unibox might make more sense to me, but for me personally it has an interface that is not to my liking and seems like an out of date messaging/texting look. It's moot, however, because Unibox is obsolete. The problem with some of the third party email utilities is that they are often relatively short-lived, that is the company abandons the product or goes out of business. Or they make you purchase upgrades so the product still works when the OS gets updated or upgraded. It's hard to make money off email add ons or tools because reading, sending, and storing emails is often free (or comes for free with things people buy anyway, like MS-Office 365) and most people are not motivated to spend more on an email extension.