(Tcl) Multipart/Alternative Email

It is very common for email to contain both plain-text and HTML alternative bodies. When a mail client such as Outlook, Eudora, or Thunderbird receives such an email, it will display one of the alternatives. The default is usually to display the HTML alternative. (In addition, the latest versions of email clients default to blocking HTML images from displaying for anti-SPAM reasons.) Emails with both plain-text and HTML alternative bodies are structured (in MIME) as multipart/alternative. The Chilkat Email component handles the MIME formatting of an email for you, so you don't have to worry about the details of the MIME composition. This example shows how to create an email with both plain-text and HTML alternative bodies.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

set email [new_CkEmail]

# First, add the typical header fields...
CkEmail_put_Subject $email "This email has alternative bodies"
set success [CkEmail_AddTo $email "Chilkat Support" "support@chilkatsoft.com"]
CkEmail_put_From $email "Matt <matt@chilkatsoft.com>"

# Setting the Body property makes a text/plain email:
CkEmail_put_Body $email "This is the plain-text body"

# At this point, our email is a simple plain/text email
# with no alternatives:
set success [CkEmail_SaveEml $email "plainText.eml"]

# Now add an HTML alternative:
set success [CkEmail_AddHtmlAlternativeBody $email "<html><body>This is the <b>HTML body</b></body></html>"]
set success [CkEmail_SaveEml $email "plainTextAndHtml.eml"]

# To create an HTML-only email, do this:
set email2 [new_CkEmail]

# First, add the typical header fields...
CkEmail_put_Subject $email2 "This email has alternative bodies"
set success [CkEmail_AddTo $email2 "Chilkat Support" "support@chilkatsoft.com"]
CkEmail_put_From $email2 "Matt <matt@chilkatsoft.com>"

CkEmail_SetHtmlBody $email2 "<html><body>This is the <b>HTML body</b></body></html>"
set success [CkEmail_SaveEml $email2 "htmlOnly.eml"]

# Add a plain-text alternative:
set success [CkEmail_AddPlainTextAlternativeBody $email2 "This is the plain-text body"]
set success [CkEmail_SaveEml $email2 "plainTextAndHtml2.eml"]

# To replace the plain-text alternative, just set the Body property:
CkEmail_put_Body $email2 "This is the new plain-text body"

# To replace the HTML alternative, call SetHtmlBody:
CkEmail_SetHtmlBody $email2 "<html><body>This is the new HTML body...</body></html>"

set success [CkEmail_SaveEml $email2 "plainTextAndHtml2a.eml"]

# To determine if an email has a particular alternative body,
# call HasPlainTextBody or HasHtmlBody:
if {[CkEmail_HasPlainTextBody $email2] == 1} then {
    puts "Has plain-text body!"
}

if {[CkEmail_HasHtmlBody $email2] == 1} then {
    puts "Has HTML body!"
}


delete_CkEmail $email
delete_CkEmail $email2