How do we get sender icon for emails in any email client (so ios mail for example ) - email

In emails these one sees companies using icons/ avatar showing up in email sender (without opening the email) .. similar to what favicon does in browser tabs, how do we set that up ? (see Medium, Wework. Brightalk example for below screenshot)
Most answers on the net seem to specific to Gmail and we are looking for a generic solution.

There's no standard for this. Every app has their own ideas and is often based on a proprietary or OS-specific address book.

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https link showing in outlook where preview should be

One of my customers mentioned to me that the way they have out look set up, allows them to see a short email preview in the form
hello#email.com
Hi, this is a message preview
However when I email, the get a big long https string and at first they thought that the email might include a virus so were dubious about opening it.
I am keen to find a way to stop this happening.
My email displays as
me#email.com
<https://z86orge6w04.....>
I use Thunderbird to send my emails, I shouldnt think that my email client would cause this though.
Also I use an smtp relay mailersend and their details are included in the https link as you will see from the pic.
I have also used socket labs and when I send using their relay, the link is still there but changes slightly
So I think that it may be something to do with the fact I use an SMTP relay
I have noticed though that it only seems to be outlook that shows this, Gmail, thunderbird and others that I have sent testemails to do not display in this manner.
At first I thought that it was because my logo in the header contained a link to the website but I have removed the link and there is no change
The part at the top circled in yellow is what they see when I email, the bit below circled in red is what they see from everyone else
The problem is not related with Thunderbird but with MailerSend which is a transactional email service.
According to mailchimp:
Transactional emails are automated emails sent from one sender to one recipient, usually related to account activity or a commercial transaction.
The URL shown in the Outlook preview is a tracking URL. You can solve this problem by removing tracking or by asking support to MailerSend.

Prevent sending mail to "Promotions" in gmail

I am using Amazon Simple Email Service to send email to my web application users. I am sending mail by using verified email by amazon as well but still, emails are being sent on Promotions tabs in Gmail.
Anyone can guide me for this?
If your mail appears to be promotional in nature, then it belongs in the Promotions tab, and that is where Gmail will present it unless a preponderance of your recipients are engaging with it in such a way as to indicate it belongs in a different tab.
Generally speaking, important and one-to-one correspondence will be presented in the Primary tab, social media in the Social tab, news alerts, newsletters, transactional mail will display in the Updates tab, and list traffic in the Forums tab.
Mail displaying in any of these tabs are, by definition, in the Gmail inbox.
I know this is al old question, but I found this excellent resource, I though it will be good to share. Follow these steps you should be out of trouble (and out of the Promotions folder, too)
https://docs.aws.amazon.com/ses/latest/dg/tips-and-best-practices.html

Mail client sender picure

UPDATE: closing and moving to https://superuser.com/q/1491110/129302
I am asking this on Stackoverflow because I honestly have no idea about the actual implementation , so depending on answer, I will move it later.
The question is: why email client, for example, Windows Mail, displays icons (sender pictures) from several companies.
As you can see, Microsoft, Tubmlr, Paypal provides pictures.
As well as Godaddy, Amazon, Github, Quora, Medium, Meetup and others.
But the majority of business senders has no sender pictures.
How sender pictures are implemented?
What I've tried already:
Let's pretend, I own hello#example.com
Added hello#example.com to Gravatar and uploaded custom icon.
Created Google Account for hello#example.com and changed account picture.
Added favicon.ico to example.com
Added webmanifest with multiple icon sizes to example.com
Tried multiple link tags in / of example.com
Configured DNS server to include all required records (SPF/TXT/DMARC/DKIM) for BIMI.
No luck yet. Are they hardcoded in email client?
That would be strange, because why Quora is hardcoded in, while Yahoo is not, so I may reject this theory.
I have also noticed, that sender picture depends on the full email address: there is a picture in email from no-reply-aws#amazon.com, but there is no in email from aws-marketing-email-replies#amazon.com
How it is done?

Option for creating a template when sending an email (to specific gmail address) in gmail

I publish myself as a personal teacher for students, and recently the number of the clients increased, and I think that a proper solution for me will be like that:
when a client sends me an email on Gmail (more correct, puts my gmail address on "send to" field), a template will show up and the client will choose from dropdowns details like: grade, subject, phone number etc.
and that will help me manage myself in a proper way.
I would like to know if that possibility even exists on gmail, and if it does, how do i operate it.
thanks for helping me.
The closest thing that I can think of is using Filters. Filters in Gmail will let you label incoming mail based on the sender, subject or more. These will then show the label in your inbox. You can then keep a Draft or spreadsheet of response templates. You can read up more on filters here.

How do I send an image via email through the built-in iPhone Mail app?

I would like to provide my users the ability to send an image/picture (displayed through a UIImageView in the app) to their friends via email using the built-in Mail app.
In a way, I want a very similar user experience to the way the Photos app does this. User clicks on a button, the image/picture is copied onto a new "compose" mail window on Mail app, and then they can finish sending the message over to whoever they want.
I searched quite a bit for tips on how to do this, and found nothing. A few people actually posted before on different message boards that this is not possible at all in SDK-land.
Anyone with more information on this?
If you plan on putting the app in the App Store, you're limited to the standard mailto links as specified in the iPhone URL Scheme Reference:
https://developer.apple.com/library/archive/featuredarticles/iPhoneURLScheme_Reference/MailLinks/MailLinks.html
The options you have within the mailto link are spelled out in RFC 2368:
https://www.ietf.org/rfc/rfc2368.txt
The only thing that seemed remotely possible was using the mailto link to set the headers to describe the message as having an attachment and then adding in the MIME/base64 encoded data within the body of the message. I highly doubt that such an approach would work since the mailto link was not intended to be used this way - the RFC states:
"The mailto URL is primarily intended for generation of short text messages that are actually the content of automatic processing (such as "subscribe" messages for mailing lists), not general MIME bodies."
However, even if the above method did work, the RFC still leaves it open to the email client to choose to ignore or otherwise modify "dangerous" headers within the link - so even if you were able to construct a valid mailto URL with a MIME body and the proper headers, Mail.app may still choose to ignore the attachment related parts of your message.
If you try to communicate with Mail.app in any other way, you have a very high likelihood of being rejected by Apple.
send the image to a web application that will inturn do the sending. using the mailto scheme will launch iphone's email application but your application will quit meaning the user will have to relaunch it later..