Newer plugin version breaks older WordPress
Versions 1.1.18 and later fail on WordPress below 6.8 and can take a site down after an update.
Tier II · Emerging Problems that are still building up.
3 public reports · first reported 16 April 2025 · last reported 11 September 2025
What's going wrong
Site owners who keep WordPress below version 6.8 report that after the SMTP Mailer WordPress plugin updated to version 1.1.18, mail sending broke with PHP fatal errors, and in one case the whole site went down.
AI-assisted: written with the help of AI from the reports. The idea report has the full summary.
In the idea report
- The full summary.
- The products the 3 reports are about, and how many came each month.
- Related problems.
No business has been found with this problem yet, so the report has no contacts. All sales are final — no refunds. Pricing.