BackdropHtmlToTextTestCase::testBackdropHtmltoTextRemoveTrailingWhitespace in core/modules/simpletest/tests/mail.test

Tests that backdrop_wrap_mail() removes trailing whitespace before newlines.

BackdropHtmlToTextTestCase::testBackdropHtmltoTextUsenetSignature in core/modules/simpletest/tests/mail.test

Tests backdrop_wrap_mail() retains whitespace from Usenet style signatures.

backdrop_html_to_text in core/includes/mail.inc

Transforms an HTML string into plain text, preserving its structure.

DefaultMailSystem::format in core/modules/system/system.mail.inc

Concatenate and wrap the email body for plain-text mails.

drupal_wrap_mail in core/includes/drupal.inc

Performs format=flowed soft wrapping for mail (RFC 3676).

MailTestCase::format in core/modules/simpletest/tests/mail.test

Concatenate and wrap the email body for plain-text mails.