If you have set up multiple mail accounts in Vivaldi Mail, you can switch who you’re sending emails as in the message composer.
Vivaldi Mail offers 3 layouts for you to choose from. Opt for the one that supports your workflow best.
To switch layouts:
Alternatively, click on the 
Toggle View button in the top right corner of the Mail tab.
Mail messages can come in either Plain text or HTML formatting. As the name indicates, messages sent in Plain Text display the email with just text without any additional formatting. Senders of HTML messages, on the other hand, can add all sorts of formatting (fonts, colors, images, etc.) to their message.
For HTML messages, Vivaldi Mail has an option to display them in Plain Text as well, removing all formatting and leaving only the core text.
To toggle the message view, either:
/ 
Show Messages as Text/HTML button in the top right corner of the window.
A signature is a personalized section that is automatically added to the end of all messages you send from Vivaldi Mail (or other mail clients).
To add a signature in Vivaldi:
If you need additional text formatting options or want to add an image to the signature, tick the box for Enable Rich Text and Images below Signature field.
To add an image, drag and drop the file to the signature field.
When you open a message in Vivaldi Mail it’s downloaded and a file for the message is created in your browser’s profile. Then you can open the email whether you have an internet connection or not. In addition, when searching, the downloaded message’s body is included in the searched content, improving search results.
To be able to view messages offline and include all message content in search even before you’ve opened the email, you only need to tick one box in Mail Settings.
To enable the setting:
Contacts Panel has all contacts that you have sent emails to or who have emailed you. To see a list of all messages a saved contact has sent you:
Mail tab with their email messages will open.
If you already have the Mail tab open and have found one email from the contact, select it and press E on your keyboard to see all their other emails.
In Vivaldi Mail and Feeds, messages don’t get marked read automatically. You’ll actively have to tell the client that you’re done with the message. This way you don’t need to remember to mark a message unread again, in case you want to follow up on it later.
Messages can be marked as read using a button in the user interface, through menus or using shortcuts. Probably the fastest way to mark messages as read is to use a single key shortcut.
Before you start using the shortcuts, make sure you’ve enabled single key shortcuts for Mail, Calendar and Feeds in Settings > Keyboard > Keyboard Shortcuts.
To mark messages as read use one of the following keys:
If you wish, you can edit the shortcuts in Settings > Keyboard > Keyboard Shortcuts > Mail.
When you often need to view emails from a specific sender, instead of searching for their emails or using the option “Show messages for Sender” every time, create a Mailing List with messages from the sender. Then you can easily open a list with all their messages from the Mail Panel.
To create a new mailing list:
Alternatively:
A folder with all their messages will be created in the Mail Panel in the Mailing Lists section.
Threaded view of the mailbox is a great way to keep related messages together in a hierarchical order, thus saving you time from needing to look for the other messages in the email conversation or trying to figure out for which message the reply is for.
To enable threaded view:
Show Message Thread / 
Hide Message Threads.
Depending on your choice, you’ll see one of the following views.
Unthreaded view
Threaded view
The center point of Vivaldi Mail, the Mail Panel displays 8 sections: All messages, Custom folders, Mailing Lists, Filters, Flags, Labels, Feeds, and All Accounts.
If the default order doesn’t suit you, you can reorder the sections. If you know you’ll never use a specific section, you can hide it altogether.
To customize the Mail Panel:
To hide a section untick the box in front of the section name.
Vivaldi Mail, Calendar and Feeds have shed the Beta tag from their name and are now proudly version 1.0. 🥳
To start using Mail, Calendar and Feeds:
If you’ve freshly installed Vivaldi or created a new User Profile, select Fully Loaded in the welcome flow.
Then you can start adding your email accounts to Mail, your calendars and events in Calendar, and keep track of the latest content from your favorite creators with Feeds.
For more info about these features check the following links:
