Post SMTP Notifications will notify you on failed emails on your WordPress site (required the WordPress plugin).
Post SMTP Notifications Extension
WordPress Plugin Download:
https://wordpress.org/plugins/post-smtp/
Source Manifest.json
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User reviews
Barry Lin (ID: 000000875670ddeb) Voted 3 ★ - Updated 11/12/2022
Meir .R. (ID: 000000d555cf080a) Voted 5 ★ - Updated 01/18/2020
Gregory Keet (ID: 000000ac0ae28ab3) Voted 5 ★ - Updated 12/23/2019
Seán O'Nilbud (ID: 4012c740c5a34097) Voted 3 ★ - Updated 03/07/2019
ND34 Yazılım (ID: 000000d5896ad04c) Voted 5 ★ - Updated 02/12/2019