Developer’s Tutorial on Sending Emails using PHPMailer and Gmail SMTP

PHPMailer is a widely used PHP library for sending email through SMTP servers, including Gmail, and is used by platforms such as WordPress, Drupal, and Joomla. The tutorial explains installing PHPMailer with Composer, configuring Gmail SMTP, and authenticating through a Google App Password or the more secure OAuth2 process because Gmail no longer permits “less secure app” access; it also notes that PHPMailer does not natively send through the Gmail API. Example workflows demonstrate sending plain-text and HTML messages, adding CC, BCC, and multiple recipients, attaching files, handling errors, closing SMTP connections, and iterating through recipient arrays for bulk sends while clearing addresses between messages. Gmail SMTP is presented as suitable for small projects but constrained by daily recipient limits, temporary sending suspensions after limits are reached, attachment-size restrictions, and undisclosed throttling rules. As an alternative, the piece describes Mailtrap’s SMTP and email-delivery services, which provide transactional and bulk sending options, domain verification, analytics, logs, deliverability alerts, and SMTP credentials that can also be used with PHPMailer.

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