Getting Started. Coding an HTML email isn't much different than coding a website was back in the late '90s. The same design tools are used to produce your final result. And the same general design principles are still in play: contrast, repetition, proximity, and alignment are all important. In this section, we'll go over some HTML email basics. Handle HTML mail: You can specify an arbitrary one from the below. (HTML used attached file.) Main flow: Select a flow to handle the mail's body or the whole MIME. Attachment flow: Select a flow to handle the attachment of the mail. The flow can be executed only when there is a file attached.

• Html Mailer
• Html Mail Tag

Basic HTML view. If you're using a browser that isn't supported, you'll see Gmail in HTML view. When you're in Basic HTML view, you won't see some Gmail features, including: Chat. Keyboard shortcuts. Adding or importing contacts. Custom 'from' addresses. Rich formatting. Use in Email, Message Boards, Forums and Web Mail (like Yahoo, Hotmail, Windows Live and Gmail.) Cloudeight Smileycons are the cutest smileys and emoticons on the web! They're easy to use, Smileycons features hundreds of smileys and original animations! Now Free Smileys and they are adware/spyware free too! Mailto link is a type of HTML link that activates the default mail client on the computer for sending an e-mail. The web browser requires a default e-mail client.

• HTML Tutorial

• HTML References

• HTML Resources

• Selected Reading

It is not difficult to put an HTML email link on your webpage but it can cause unnecessary spamming problem for your email account. There are people, who can run programs to harvest these types of emails and later use them for spamming in various ways.

You can have another option to facilitate people to send you emails. One option could be to use HTML forms to collect user data and then use PHP or CGI script to send an email.

A simple example, check our Contact Us Form. We take user feedback using this form and then we are using one CGI program which is collecting this information and sending us email to the one given email ID.

Note − You will learn about HTML Forms in HTML Forms and you will learn about CGI in our another tutorial Perl CGI Programming.

HTML Email Tag

HTML <a> tag provides you option to specify an email address to send an email. While using <a> tag as an email tag, you will use mailto: email address along with href attribute. Following is the syntax of using mailto instead of using http.

This code will generate the following link which you can use to send email.

Now, if a user clicks this link, it launches one Email Client (like Lotus Notes, Outlook Express etc. ) installed on your user's computer. There is another risk to use this option to send email because if user do not have email client installed on their computer then it would not be possible to send email.

Default Settings

You can specify a default email subject and email body along with your email address. Following is the example to use default subject and body.

This code will generate the following link which you can use to send email.

HTML email is the use of a subset of HTML to provide formatting and semantic markup capabilities in email that are not available with plain text:^[1] Text can be linked without displaying a URL, or breaking long URLs into multiple pieces. Text is wrapped to fit the width of the viewing window, rather than uniformly breaking each line at 78 characters (defined in RFC 5322, which was necessary on older text terminals). It allows in-line inclusion of images, tables, as well as diagrams or mathematical formulae as images, which are otherwise difficult to convey (typically using ASCII art).

Adoption[edit]

Most graphical email clients support HTML email, and many default to it. Many of these clients include both a GUI editor for composing HTML emails and a rendering engine for displaying received HTML emails.

Since its conception, a number of people have vocally opposed all HTML email (and even MIME itself), for a variety of reasons.^[2] For instance, the ASCII Ribbon Campaign advocated that all email should be sent in ASCII text format. The campaign was unsuccessful and was abandoned in 2013.^[3][4] While still considered inappropriate in many newsgroup postings and mailing lists, its adoption for personal and business mail has only increased over time. Some of those who strongly opposed it when it first came out now see it as mostly harmless.^[5]

According to surveys by online marketing companies, adoption of HTML-capable email clients is now nearly universal, with less than 3% reporting that they use text-only clients.^[6] The majority of users prefer to receive HTML emails over plain text.^[7][8]

Compatibility[edit]

Email software that complies with RFC 2822 is only required to support plain text, not HTML formatting. Sending HTML formatted emails can therefore lead to problems if the recipient's email client does not support it. In the worst case, the recipient will see the HTML code instead of the intended message.

Among those email clients that do support HTML, some do not render it consistently with W3C specifications, and many HTML emails are not compliant either, which may cause rendering or delivery problems.

Html Mailer

In particular, the <head> tag, which is used to house CSS style rules for an entire HTML document, is not well supported, sometimes stripped entirely, causing in-line style declarations to be the de facto standard, even though in-line style declarations are inefficient and fail to take good advantage of HTML's ability to separate style from content.^{[citation needed]} Although workarounds have been developed,^[9] this has caused no shortage of frustration among newsletter developers, spawning the grassrootsEmail Standards Project, which grades email clients on their rendering of an acid test, inspired by those of the Web Standards Project, and lobbies developers to improve their products. To persuade Google to improve rendering in Gmail, for instance, they published a video montage of grimacing web developers,^[10] resulting in attention from an employee.

Style[edit]

Some senders may excessively rely upon large, colorful, or distracting fonts, making messages more difficult to read.^[11] For those especially bothered by this formatting, some user agents make it possible for the reader to partially override the formatting (for instance, Mozilla Thunderbird allows specifying a minimum font size); however, these capabilities are not globally available. Further, the difference in optical appearance between the sender and the reader can help to differentiate the author of each section, improving readability.

Multi-part formats[edit]

Many email servers are configured to automatically generate a plain text version of a message and send it along with the HTML version, to ensure that it can be read even by text-only email clients, using the Content-Type: multipart/alternative, as specified in RFC 1521.^[12][13][14] The message itself is of type multipart/alternative, and contains two parts, the first of type text/plain, which is read by text-only clients, and the second with text/html, which is read by HTML-capable clients. The plain text version may be missing important formatting information, however. (For example, a mathematical equation may lose a superscript and take on an entirely new meaning.)

Many^{[citation needed]}mailing lists deliberately block HTML email, either stripping out the HTML part to just leave the plain text part or rejecting the entire message.^{[citation needed]}

The order of the parts is significant. RFC1341 states that: In general, user agents that compose multipart/alternative entities should place the body parts in increasing order of preference, that is, with the preferred format last.^[15] For multipart emails with html and plain-text versions, that means listing the plain-text version first and the html version after it, otherwise the client may default to showing the plain-text version even though an html version is available.

Message size[edit]

HTML email is larger than plain text. Even if no special formatting is used, there will be the overhead from the tags used in a minimal HTML document, and if formatting is heavily used it may be much higher. Multi-part messages, with duplicate copies of the same content in different formats, increase the size even further. The plain text section of a multi-part message can be retrieved by itself, though, using IMAP's FETCH command.^[16]

Although the difference in download time between plain text and mixed message mail (which can be a factor of ten or more) was of concern in the 1990s (when most users were accessing email servers through slow modems), on a modern connection the difference is negligible for most people, especially when compared to images, music files, or other common attachments.^[17]

Security vulnerabilities[edit]

HTML allows a link to be displayed as arbitrary text, so that rather than displaying the full URL, a link may show only part of it or simply a user-friendly target name. This can be used in phishing attacks, in which users are fooled into believing that a link points to the website of an authoritative source (such as a bank), visiting it, and unintentionally revealing personal details (like bank account numbers) to a scammer.

If an email contains web bugs (inline content from an external server, such as a picture), the server can alert a third party that the email has been opened. This is a potential privacy risk, revealing that an email address is real (so that it can be targeted in the future) and revealing when the message was read.

Html Mail Tag

HTML content requires email programs to use engines to parse, render and display the document. This can lead to more security vulnerabilities, denial of service or low performance on older computers.

During periods of increased network threats, the US Department of Defense converts all incoming HTML email to text email.^[18]

The multipart type is intended to show the same content in different ways, but this is sometimes abused; some email spam takes advantage of the format to trick spam filters into believing that the message is legitimate. They do this by including innocuous content in the text part of the message and putting the spam in the HTML part (that which is displayed to the user).

Most email spam is sent in HTML^{[citation needed]} for these reasons, so spam filters sometimes give higher spam scores to HTML messages.^{[citation needed]}

In 2018 EFAIL was unveiled, a severe vulnerability which could disclose the actual content of encrypted HTML emails to an attacker.

See also[edit]

• Plaintext email – the simplest form of email that does not support rich formatting
• Enriched text – an HTML-like system for email using MIME

References[edit]

1. ^'Text Email vs HTML Email – The Pros and Cons | Thunder Mailer – Mass Emailing Software'. www.thundermailer.com. Retrieved 30 January 2016.
2. ^HTML Email: Whenever Possible, Turn It Off!
3. ^'The Ascii Ribbon Campaign official homepage'. Archived from the original on 11 March 2010. Retrieved 30 January 2016.
4. ^'Shutdown of the ASCII ribbon campaign - Pale Moon forum'. forum.palemoon.org. Archived from the original on 3 February 2016. Retrieved 30 January 2016.
5. ^HTML Email: The Poll (Scot Hacker, originator of the much-linked-to Why HTML in E-Mail is a Bad Idea discusses how his feelings have changed since the 1990s)
6. ^'Email Marketing Statistics and Metrics - EmailLabs'. 29 March 2007. Archived from the original on 29 March 2007. Retrieved 30 January 2016. HTML has nearly universal adoption among consumers: A Jupiter Research consumer survey found just 3% receive only text email.
7. ^Grossman, Edward (9 July 2002). 'Real-World Email Client Usage: The Hard Data | ClickZ'. www.clickz.com. Retrieved 30 January 2016. Do you prefer receiving HTML or text email? HTML: 41.95%, Text: 31.52%, No preference: 26.53%
8. ^'The Science of Email Marketing'. www.slideshare.net. Retrieved 30 January 2016. In what format do you prefer to receive email messages from companies? HTML: 88%, Plain text: 12%
9. ^Dialect <http://dialect.ca/>. 'Premailer: make CSS inline for HTML e-mail'. Premailer.dialect.ca. Retrieved 24 June 2012.
10. ^'The 2008 Gmail Appeal | Email Standards Project'. Email-standards.org. Archived from the original on 15 May 2012. Retrieved 24 June 2012.
11. ^Shobe, Matt (12 October 2004). 'A pretty fair argument against HTML Email'. Burningdoor.com. Archived from the original on 24 April 2012. Retrieved 24 June 2012.
12. ^RFC 1521 7.2.3. The Multipart/alternative subtype
13. ^'TN1010-11-2: Multipart/Alternative — Gracefully handling HTML-phobic email clients'(PDF). Retrieved 24 June 2012.
14. ^'Sending HTML and Plain Text E-Mail Simultaneously'. Wilsonweb.com. 28 April 2000. Retrieved 24 June 2012.
15. ^'RFC1341 Section 7.2 The Multipart Content-Type'. Retrieved 15 July 2014.
16. ^'Do we really want to send web pages in e-mail?'. Dsv.su.se. Retrieved 24 June 2012.
17. ^HTML Email — Still Evil?
18. ^'DOD bars use of HTML e-mail, Outlook Web Access'. fcw.com. Retrieved 23 June 2015.