Lianja

Extract Linked Domains from an HTML Email

Demonstrates the Chilkat Email.LinkedDomains method, which extracts the domain names from the hyperlinks in an HTML email. Lowercase domains are appended to a StringTable without creating duplicates. This example sets an HTML body with several links and lists the distinct domains.

Background: The set of domains a message links to is a strong signal for spam and phishing analysis — legitimate mail usually points at a few expected domains, while abusive mail often hides links to many unrelated or look-alike hosts. LinkedDomains gives you that de-duplicated list directly. Note it only parses the links; it does not fetch them, so no network request is made.

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llSuccess = .F.

//  Demonstrates the LinkedDomains method, which extracts the domain names from the
//  hyperlinks in an HTML email.  Lowercase domains are appended to a StringTable without
//  creating duplicates.

loEmail = createobject("CkEmail")
loEmail.Subject = "LinkedDomains example"

//  An HTML body containing several hyperlinks.
loEmail.SetHtmlBody('<html><body>Visit <a href="https://www.example.com/page">Example</a>, <a href="http://sales.contoso.com">Contoso</a>, and <a href="https://www.example.com/other">Example again</a>.</body></html>')

//  Extract the linked domains into a StringTable.
loDomains = createobject("CkStringTable")

llSuccess = loEmail.LinkedDomains(loDomains)
if (llSuccess = .F.) then
    ? loEmail.LastErrorText
    release loEmail
    release loDomains
    return
endif

n = loDomains.Count

for i = 0 to n - 1
    ? loDomains.StringAt(i)
next


release loEmail
release loDomains