While our Mozilla Mail tutorial focuses on Windows, keep in mind that Mozilla Mail is a "cross-platform" email client: it runs and operates the same way on Windows, Apple's Mac OS X and Linux.
The Mozilla Foundation also offers the standalone Thunderbird email client: see the Mozilla Thunderbird Tutorial
Send Emails with Mozilla Mail or SeaMonkey Mail
This is where the action starts: using Mozilla Mail to communicate with your friends, colleagues and clients. Mozilla Mail was designed for the general public, as an alternative to Microsoft's Outlook Express, (or Outlook, but only Outlook Express is free.) For this reason, it is very user-friendly.
The icons are clean, large, and labeled, which makes it easy to use the program right after install. (Many other email programs are configured by default to displaying small, un-labeled icons.)
If you have ever used Microsoft Outlook or Outlook Express, Mozilla Mail will seem familiar. Mozilla Mail has more features than Outlook Express, but is just as user-friendly.
Creating a New Email

Click the "Write" button to create a new email, a blank email will popup. (Alternatively, you can press Ctrl+M on your keyboard.)
Ctrl+M Create a blank email
The email account you have just setup should be visible in the top drop-down menu: from left to right, it should display your name (as you chose it to appear for outgoing emails), your actual email address enclosed in <angular brackets>, and the nickname you gave to your email account.
Below is the area where you'll pick email recipients for your email. There are four lines visible, but as you'll see, this number can be increased as needed.
The "Subject" line, where you'll enter your email title. If you leave it blank, Mozilla Mail will give you a last chance before sending your email with "(No Subject)" as title for your email.
Finally, the email content goes in the text area at the bottom. Although they are disabled until you focus in the text area, you can see the text control for "Rich Text Editing," that give you the possibility to format your emails: different font families and font sizes, bold, italic, underlined, numbered lists, etc.
Ctrl+SSave in Drafts the email you are editing
Formatting Your Emails in Mozilla Mail
Mozilla Mail supports plain text and "rich format" emails, allowing you to format the content of your emails. Once you click inside the email content area, the formatting toolbar will show clickable buttons, (they are disabled until your cursor focuses inside the body of the email.)
Ctrl+B Bold
Ctrl+U Underlined
Ctrl+I Italic
The Insert Button on Mozilla Mail's formatting toolbar allows you to insert non-text elements in your emails:
• A clickable link (like "www.FreeEmailTutorials.com")
• An "anchor" (a link that points to an internal spot in your email content)
• An image (from your hard-drive, or using an Internet address)
• An "H.Line" (an horizontal line to separate blocks of text)
• A table (to display data in rows and columns)
Ctrl+L Insert Link

Mozilla Mail's Insert a Smiley Face menu allows you to enter smiley icons (also called "emoticons") to spice up your emails. To email clients not supporting expressions to smiley faces, a wink would simply appear as ";)"
Sending Attachments with Your Emails
Mozilla Mail lets you send emails with attachments, or … web pages! This is a very nice feature if you want to forward a whole web page to a friend. You will probably come to love this feature: sending the whole page saves your friends a link click.
To quickly attach a file to your email, click the white area where attachments are displayed.
To send a web page with Mozilla Mail, click the drop-down arrow to the right of the Attach button. Mozilla Mail will prompt you for the web page's address (or "URL").
The easiest is to copy-paste the address from your web browser; otherwise, type the complete URL, as in "http://www.FreeEmailTutorials.com/".
Some email providers or system administrators block attachments. Make sure your friends have received your email before deciding not to answer their calls.
Sending Emails with Mozilla Mail
Once you click Mozilla Mail's Send button, your email is queued: it is temporarily stored in the Outbox folder. If no Internet connection is currently available, Mozilla Mail will keep your emails stored in the Outbox until it can access your mail server.
Working Offline: you can force Mozilla Mail to work offline if you do not want it to check for new emails or send your emails. Go to File > Offline > Work Offline. By choosing "Offline Settings", you can customize Mozilla Mail's offline behavior when opening Mozilla Mail, when going offline, and when sending emails while in offline mode.
Once a connection is successfully established with the mail server, Mozilla Mail will display an email delivery message, which should only appear for a few seconds.
The Sending Messages box would appear longer if your Internet connection is slow, busy, or if you are sending large attachments.
Ctrl+Enter Send an email
By default, Mozilla Mail stores a copy of the emails you sent in the Sent folder. This is useful, but can be turned off.
Don't want copies of sent emails in the Sent folder? Go to Edit > Mail & Newsgroups Account Settings. Choose Copies & Folders of the desired email account, check or uncheck the Place a copy in checkbox, and Mozilla Mail will stop copying sent emails in the Sent folder.
Mozilla Mail's Spell Checker
To turn On or Off Mozilla Mail's spell checker, go to Edit > Mail & Newsgroups Account Settings, click in Composition under Mail & Newsgroups, and check/uncheck the Check spelling before sending checkbox.
After clicking the send button, Mozilla Mail will popup the spell checker if any word in your email is not recognized. You can then choose to follow its advice, or disregard it by clicking Send.
If U.S. English isn't your primary or only language, you can download additional languages dictionaries from the web: Dictionaries.Mozdev.org/Installation.html 


Email Clients Tutorials
Mozilla Mail Tutorial