Troubleshoot PHP Email That Is Not Being Delivered
Separate application errors, SMTP rejection, authentication problems, bounces, and spam placement.
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Separate application errors, SMTP rejection, authentication problems, bounces, and spam placement.
Use UTF-8 consistently for non-English subjects, sender names, and message bodies.
Attach generated files and embed an image by content ID while controlling paths and size.
Provide equivalent HTML and plain-text bodies so recipients can use the format their client supports.
Configure PHPMailer for authenticated SMTP with TLS and credentials kept outside source code.
Create private temporary files and remove them reliably without touching unrelated system data.
Open a DOCX package and extract readable paragraphs from its document XML.
Create ZIP downloads and reject unsafe paths before extracting archives with ZipArchive.
Stream a CSV file row by row, validate its header, and keep memory use stable.
Read JPEG orientation metadata and rotate uploaded photos before creating thumbnails.