Released version 4.1.1

🐛 Bug Fixes

• Message::setHtmlBody() – survives large inline data: URIs. A >500 kB base64 payload used to exhaust PCRE's backtrack limit and abort the whole send; the regex is now backtracking-free (#79)
• Message::setHtmlBody() – embeds images whose quoted src="…" or url('…') contains spaces, like "holiday photos/beach.jpg" (#97)
• Message::setHtmlBody() – embeds images whose quoted path contains parentheses, so the classic screenshot (1).png naming no longer silently breaks (#89)
• SendmailMailer – signs the full message so DKIM now covers Subject and To headers, closing a deliverability gap at Gmail, Outlook, and other strict providers (#99)
• MimePart – quotes address phrases containing special characters before MIME-encoding, producing spec-compliant headers even when names include commas, angle brackets, or quotes (#102)
• CssInliner – gracefully skips selectors the DOM engine can't evaluate; pseudo-classes and pseudo-elements like ::marker, :hover, :checked no longer break inlining
• CssInliner – tokenizer regex fixed for very long strings and invalid url() quote combinations that previously tripped the parser