| Type: | string |
| Default: | n/a |
Description: Adds an extra header to the e-mail with the specified name and content. The first parameter sets the name of the header, the second one its value. The value of the header can contain macros. Set the header() option multiple times to add multiple headers. For example:
header("X-Program", "$PROGRAM")
When using the header option, note the following points:
Do not use the header() option to set the values of headers that have dedicated options. Use it only to add extra headers.
If you set the same custom header multiple times, only the first will be added to the e-mail, other occurrences will be ignored.
It is not possible to set the DATE, Return-Path, Original-Recipient, Content-*, MIME-*, Resent-*, Received headers.
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