There are many email appearance changes that you can make in AltaMail. Open the App Settings (View) - App Appearance section.

The "Dynamic Type" setting from the Device Settings App will apply to viewing emails. You can also overide your device "Dynamic Type" setting in the App Appearance settings.

Email Appearance
When you tap on 'Email Appearance' you will see a wide range of choices for the email layout.

The top section of this screen shows the email list screen settings. Tap on each part of the email list display to change the font, color and size of each text field. You can change the subject, sender and summary text.
Use the settings below this to change other layout options such as the number of lines in the email summary and what buttons appear, eg. flag, star pinned etc.
You can hide the contact icon image and change the color of unread emails. The account color can be displayed as a bar on the side or as the background of the email row.
You can change the email inbox list background color and also the colors of the email thread messages for sent and received emails.

If you switch to Dark Mode the Email Appearance settings will be different. When you edit settings while using Dark Mode those settings are only used for Dark Mode. Switching to Light Mode will use a different set of Email Appearance settings.


Sender
The 'Contact Avatar Images for verified senders' setting will show contact avatar icons for emails that are verified as being sent from the sender address. View
The 'Contact Avatar Images for known senders' setting will show contact avatar icons for all known email senders. For example emails that you have previously sent emails to and your contacts.

The two 'From Address' settings allow you to show a full email address as well as the sender name. For example you could show the full address when the sender is not a known sender so you can check if the email address matches the person or company name.


Viewing Emails
You can use the 'Increase email text viewing size' to view emails with larger fonts to make reading easier.

For email sent by Outlook and Exchange, you can change the 'Outlook Compatibility Message Layout' setting.

If emails appear too large, images are missing or are scrolled off the side of the screen, then you can change the 'Device Compatibility Message Layout' setting.


Composing Emails
Here you can choose the default email font, size and color. This will be used for your new emails and replies to existing emails. This setting will also be used for incoming emails with no font formatting and plain text emails.

You can also choose the background color for editing emails.