I was trying out Drupal CMS with SMTP added for a Mailpit server for testing and the e-mails are not sent. The log displays this error:
An attempt to send an e-mail message failed, and the following error message was returned : Error creating transports: Unsupported sendmail command flags "/bin/true"; must be one of "-bs" or "-t" but can include additional flags.
The e-mail carried the following headers:
Subject: Drupal Symfony Mailer Lite has been successfully configured!<br /> Mime-Version: 1.0<br /> X-Mailer: Drupal<br /> Return-Path: <admin@example.com><br /> Sender: admin@example.com<br /> To: admin@example.com<br /> From: My Drupal CMS site <admin@example.com><br /> Reply-To: admin@example.com<br />
When I install the Drupal Symfony Mailer → module with the same SMTP credentials, then it works fine.
Active
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I think this is a dupe of 💬 Sendmail transport won't work with Mailhog/MailPit Closed: works as designed . The TLDR is to switch to the Native transport. That seems to work fine for Mailpit for most people.