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The SparkPost handler always sent the body as content.html, so a plain-text email's line breaks collapsed in mail clients. A text/plain message now goes out as content.text only, as the Brevo handler already does. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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The SparkPost handler always sends the message body as
content.html, even when the email is plain text. Mail clients then render the plain text as HTML, so every line break collapses and the message runs together on one line.This sends a
text/plainmessage ascontent.textonly, the same way the Brevo handler already does (Providers/SendInBlue/Handler.php). HTML and multipart messages are unchanged.Tested: I sent the same plain-text message through SparkPost's transmissions API with the payload before and after this change. Before, it arrived as one line. After, the line breaks were intact. FluentSMTP 2.4.0, WordPress 7.1, PHP 8.4.